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diff --git a/OpenSim/Services/Connectors/SimianGrid/SimianPresenceServiceConnector.cs b/OpenSim/Services/Connectors/SimianGrid/SimianPresenceServiceConnector.cs
new file mode 100644
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+++ b/OpenSim/Services/Connectors/SimianGrid/SimianPresenceServiceConnector.cs
@@ -0,0 +1,511 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Net;
+using System.Reflection;
+using log4net;
+using Mono.Addins;
+using Nini.Config;
+using OpenSim.Framework;
+using OpenSim.Framework.Servers.HttpServer;
+using OpenSim.Region.Framework.Interfaces;
+using OpenSim.Region.Framework.Scenes;
+using OpenSim.Services.Interfaces;
+using OpenSim.Server.Base;
+using OpenMetaverse;
+using OpenMetaverse.StructuredData;
+
+using PresenceInfo = OpenSim.Services.Interfaces.PresenceInfo;
+
+namespace OpenSim.Services.Connectors.SimianGrid
+{
+    /// <summary>
+    /// Connects avatar presence information (for tracking current location and
+    /// message routing) to the SimianGrid backend
+    /// </summary>
+    [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule")]
+    public class SimianPresenceServiceConnector : IPresenceService, ISharedRegionModule
+    {
+        private static readonly ILog m_log =
+                LogManager.GetLogger(
+                MethodBase.GetCurrentMethod().DeclaringType);
+
+        private string m_serverUrl = String.Empty;
+
+        #region ISharedRegionModule
+
+        public Type ReplaceableInterface { get { return null; } }
+        public void RegionLoaded(Scene scene) { }
+        public void PostInitialise() { }
+        public void Close() { }
+
+        public SimianPresenceServiceConnector() { }
+        public string Name { get { return "SimianPresenceServiceConnector"; } }
+        public void AddRegion(Scene scene)
+        {
+            if (!String.IsNullOrEmpty(m_serverUrl))
+            {
+                scene.RegisterModuleInterface<IPresenceService>(this);
+
+                scene.EventManager.OnMakeRootAgent += MakeRootAgentHandler;
+                scene.EventManager.OnNewClient += NewClientHandler;
+                scene.EventManager.OnSignificantClientMovement += SignificantClientMovementHandler;
+
+                LogoutRegionAgents(scene.RegionInfo.RegionID);
+            }
+        }
+        public void RemoveRegion(Scene scene)
+        {
+            if (!String.IsNullOrEmpty(m_serverUrl))
+            {
+                scene.UnregisterModuleInterface<IPresenceService>(this);
+
+                scene.EventManager.OnMakeRootAgent -= MakeRootAgentHandler;
+                scene.EventManager.OnNewClient -= NewClientHandler;
+                scene.EventManager.OnSignificantClientMovement -= SignificantClientMovementHandler;
+
+                LogoutRegionAgents(scene.RegionInfo.RegionID);
+            }
+        }
+
+        #endregion ISharedRegionModule
+
+        public SimianPresenceServiceConnector(IConfigSource source)
+        {
+            Initialise(source);
+        }
+
+        public void Initialise(IConfigSource source)
+        {
+            if (Simian.IsSimianEnabled(source, "PresenceServices"))
+            {
+                IConfig gridConfig = source.Configs["PresenceService"];
+                if (gridConfig == null)
+                {
+                    m_log.Error("[PRESENCE CONNECTOR]: PresenceService missing from OpenSim.ini");
+                    throw new Exception("Presence connector init error");
+                }
+
+                string serviceUrl = gridConfig.GetString("PresenceServerURI");
+                if (String.IsNullOrEmpty(serviceUrl))
+                {
+                    m_log.Error("[PRESENCE CONNECTOR]: No PresenceServerURI in section PresenceService");
+                    throw new Exception("Presence connector init error");
+                }
+
+                m_serverUrl = serviceUrl;
+            }
+        }
+
+        #region IPresenceService
+
+        public bool LoginAgent(string userID, UUID sessionID, UUID secureSessionID)
+        {
+            m_log.ErrorFormat("[PRESENCE CONNECTOR]: Login requested, UserID={0}, SessionID={1}, SecureSessionID={2}",
+                userID, sessionID, secureSessionID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "AddSession" },
+                { "UserID", userID.ToString() }
+            };
+            if (sessionID != UUID.Zero)
+            {
+                requestArgs["SessionID"] = sessionID.ToString();
+                requestArgs["SecureSessionID"] = secureSessionID.ToString();
+            }
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (!success)
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to login agent " + userID + ": " + response["Message"].AsString());
+
+            return success;
+        }
+
+        public bool LogoutAgent(UUID sessionID, Vector3 position, Vector3 lookAt)
+        {
+            m_log.InfoFormat("[PRESENCE CONNECTOR]: Logout requested for agent with sessionID " + sessionID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "RemoveSession" },
+                { "SessionID", sessionID.ToString() }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (!success)
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to logout agent with sessionID " + sessionID + ": " + response["Message"].AsString());
+
+            return success;
+        }
+
+        public bool LogoutRegionAgents(UUID regionID)
+        {
+            m_log.InfoFormat("[PRESENCE CONNECTOR]: Logout requested for all agents in region " + regionID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "RemoveSessions" },
+                { "SceneID", regionID.ToString() }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (!success)
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to logout agents from region " + regionID + ": " + response["Message"].AsString());
+
+            return success;
+        }
+
+        public bool ReportAgent(UUID sessionID, UUID regionID, Vector3 position, Vector3 lookAt)
+        {
+            //m_log.DebugFormat("[PRESENCE CONNECTOR]: Updating session data for agent with sessionID " + sessionID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "UpdateSession" },
+                { "SessionID", sessionID.ToString() },
+                { "SceneID", regionID.ToString() },
+                { "ScenePosition", position.ToString() },
+                { "SceneLookAt", lookAt.ToString() }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (!success)
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to update agent session " + sessionID + ": " + response["Message"].AsString());
+
+            return success;
+        }
+
+        public PresenceInfo GetAgent(UUID sessionID)
+        {
+            m_log.DebugFormat("[PRESENCE CONNECTOR]: Requesting session data for agent with sessionID " + sessionID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "GetSession" },
+                { "SessionID", sessionID.ToString() }
+            };
+
+            OSDMap sessionResponse = WebUtil.PostToService(m_serverUrl, requestArgs);
+            if (sessionResponse["Success"].AsBoolean())
+            {
+                UUID userID = sessionResponse["UserID"].AsUUID();
+                m_log.DebugFormat("[PRESENCE CONNECTOR]: Requesting user data for " + userID);
+
+                requestArgs = new NameValueCollection
+                {
+                    { "RequestMethod", "GetUser" },
+                    { "UserID", userID.ToString() }
+                };
+
+                OSDMap userResponse = WebUtil.PostToService(m_serverUrl, requestArgs);
+                if (userResponse["Success"].AsBoolean())
+                    return ResponseToPresenceInfo(sessionResponse, userResponse);
+                else
+                    m_log.Warn("[PRESENCE CONNECTOR]: Failed to retrieve user data for " + userID + ": " + userResponse["Message"].AsString());
+            }
+            else
+            {
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to retrieve session " + sessionID + ": " + sessionResponse["Message"].AsString());
+            }
+
+            return null;
+        }
+
+        public PresenceInfo[] GetAgents(string[] userIDs)
+        {
+            List<PresenceInfo> presences = new List<PresenceInfo>(userIDs.Length);
+
+            for (int i = 0; i < userIDs.Length; i++)
+            {
+                UUID userID;
+                if (UUID.TryParse(userIDs[i], out userID) && userID != UUID.Zero)
+                    presences.AddRange(GetSessions(userID));
+            }
+
+            return presences.ToArray();
+        }
+
+        public bool SetHomeLocation(string userID, UUID regionID, Vector3 position, Vector3 lookAt)
+        {
+            m_log.DebugFormat("[PRESENCE CONNECTOR]: Setting home location for user  " + userID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "AddUserData" },
+                { "UserID", userID.ToString() },
+                { "HomeLocation", SerializeLocation(regionID, position, lookAt) }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (!success)
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to set home location for " + userID + ": " + response["Message"].AsString());
+
+            return success;
+        }
+
+        #endregion IPresenceService
+
+        #region Presence Detection
+
+        private void MakeRootAgentHandler(ScenePresence sp)
+        {
+            m_log.DebugFormat("[PRESENCE DETECTOR]: Detected root presence {0} in {1}", sp.UUID, sp.Scene.RegionInfo.RegionName);
+
+            ReportAgent(sp.ControllingClient.SessionId, sp.Scene.RegionInfo.RegionID, sp.AbsolutePosition, sp.Lookat);
+            SetLastLocation(sp.UUID, sp.Scene.RegionInfo.RegionID, sp.AbsolutePosition, sp.Lookat);
+        }
+
+        private void NewClientHandler(IClientAPI client)
+        {
+            client.OnConnectionClosed += LogoutHandler;
+        }
+
+        private void SignificantClientMovementHandler(IClientAPI client)
+        {
+            ScenePresence sp;
+            if (client.Scene is Scene && ((Scene)client.Scene).TryGetAvatar(client.AgentId, out sp))
+                ReportAgent(sp.ControllingClient.SessionId, sp.Scene.RegionInfo.RegionID, sp.AbsolutePosition, sp.Lookat);
+        }
+
+        private void LogoutHandler(IClientAPI client)
+        {
+            if (client.IsLoggingOut)
+            {
+                client.OnConnectionClosed -= LogoutHandler;
+
+                object obj;
+                if (client.Scene.TryGetAvatar(client.AgentId, out obj) && obj is ScenePresence)
+                {
+                    // The avatar is still in the scene, we can get the exact logout position
+                    ScenePresence sp = (ScenePresence)obj;
+                    SetLastLocation(client.AgentId, client.Scene.RegionInfo.RegionID, sp.AbsolutePosition, sp.Lookat);
+                }
+                else
+                {
+                    // The avatar was already removed from the scene, store LastLocation using the most recent session data
+                    m_log.Warn("[PRESENCE]: " + client.Name + " has already been removed from the scene, storing approximate LastLocation");
+                    SetLastLocation(client.SessionId);
+                }
+
+                LogoutAgent(client.SessionId, Vector3.Zero, Vector3.UnitX);
+            }
+        }
+
+        #endregion Presence Detection
+
+        #region Helpers
+
+        private OSDMap GetUserData(UUID userID)
+        {
+            m_log.DebugFormat("[PRESENCE CONNECTOR]: Requesting user data for " + userID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "GetUser" },
+                { "UserID", userID.ToString() }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            if (response["Success"].AsBoolean() && response["User"] is OSDMap)
+                return response;
+            else
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to retrieve user data for " + userID + ": " + response["Message"].AsString());
+
+            return null;
+        }
+
+        private OSDMap GetSessionData(UUID sessionID)
+        {
+            m_log.DebugFormat("[PRESENCE CONNECTOR]: Requesting session data for session " + sessionID);
+
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "GetSession" },
+                { "SessionID", sessionID.ToString() }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            if (response["Success"].AsBoolean())
+                return response;
+            else
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to retrieve session data for session " + sessionID);
+
+            return null;
+        }
+
+        private List<PresenceInfo> GetSessions(UUID userID)
+        {
+            List<PresenceInfo> presences = new List<PresenceInfo>(1);
+
+            OSDMap userResponse = GetUserData(userID);
+            if (userResponse != null)
+            {
+                m_log.DebugFormat("[PRESENCE CONNECTOR]: Requesting sessions for " + userID);
+
+                NameValueCollection requestArgs = new NameValueCollection
+                {
+                    { "RequestMethod", "GetSession" },
+                    { "UserID", userID.ToString() }
+                };
+
+                OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+                if (response["Success"].AsBoolean())
+                {
+                    PresenceInfo presence = ResponseToPresenceInfo(response, userResponse);
+                    if (presence != null)
+                        presences.Add(presence);
+                }
+                else
+                {
+                    m_log.Warn("[PRESENCE CONNECTOR]: Failed to retrieve sessions for " + userID + ": " + response["Message"].AsString());
+                }
+            }
+
+            return presences;
+        }
+
+        /// <summary>
+        /// Fetch the last known avatar location with GetSession and persist it
+        /// as user data with AddUserData
+        /// </summary>
+        private bool SetLastLocation(UUID sessionID)
+        {
+            NameValueCollection requestArgs = new NameValueCollection
+            {
+                { "RequestMethod", "GetSession" },
+                { "SessionID", sessionID.ToString() }
+            };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (success)
+            {
+                UUID userID = response["UserID"].AsUUID();
+                UUID sceneID = response["SceneID"].AsUUID();
+                Vector3 position = response["ScenePosition"].AsVector3();
+                Vector3 lookAt = response["SceneLookAt"].AsVector3();
+
+                return SetLastLocation(userID, sceneID, position, lookAt);
+            }
+            else
+            {
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to retrieve presence information for session " + sessionID +
+                    " while saving last location: " + response["Message"].AsString());
+            }
+
+            return success;
+        }
+
+        private bool SetLastLocation(UUID userID, UUID sceneID, Vector3 position, Vector3 lookAt)
+        {
+            NameValueCollection requestArgs = new NameValueCollection
+                {
+                    { "RequestMethod", "AddUserData" },
+                    { "UserID", userID.ToString() },
+                    { "LastLocation", SerializeLocation(sceneID, position, lookAt) }
+                };
+
+            OSDMap response = WebUtil.PostToService(m_serverUrl, requestArgs);
+            bool success = response["Success"].AsBoolean();
+
+            if (!success)
+                m_log.Warn("[PRESENCE CONNECTOR]: Failed to set last location for " + userID + ": " + response["Message"].AsString());
+
+            return success;
+        }
+
+        private PresenceInfo ResponseToPresenceInfo(OSDMap sessionResponse, OSDMap userResponse)
+        {
+            if (sessionResponse == null)
+                return null;
+
+            PresenceInfo info = new PresenceInfo();
+
+            info.Online = true;
+            info.UserID = sessionResponse["UserID"].AsUUID().ToString();
+            info.RegionID = sessionResponse["SceneID"].AsUUID();
+            info.Position = sessionResponse["ScenePosition"].AsVector3();
+            info.LookAt = sessionResponse["SceneLookAt"].AsVector3();
+
+            if (userResponse != null && userResponse["User"] is OSDMap)
+            {
+                OSDMap user = (OSDMap)userResponse["User"];
+
+                info.Login = user["LastLoginDate"].AsDate();
+                info.Logout = user["LastLogoutDate"].AsDate();
+                DeserializeLocation(user["HomeLocation"].AsString(), out info.HomeRegionID, out info.HomePosition, out info.HomeLookAt);
+            }
+
+            return info;
+        }
+
+        private string SerializeLocation(UUID regionID, Vector3 position, Vector3 lookAt)
+        {
+            return "{" + String.Format("\"SceneID\":\"{0}\",\"Position\":\"{1}\",\"LookAt\":\"{2}\"", regionID, position, lookAt) + "}";
+        }
+
+        private bool DeserializeLocation(string location, out UUID regionID, out Vector3 position, out Vector3 lookAt)
+        {
+            OSDMap map = null;
+
+            try { map = OSDParser.DeserializeJson(location) as OSDMap; }
+            catch { }
+
+            if (map != null)
+            {
+                regionID = map["SceneID"].AsUUID();
+                if (Vector3.TryParse(map["Position"].AsString(), out position) &&
+                    Vector3.TryParse(map["LookAt"].AsString(), out lookAt))
+                {
+                    return true;
+                }
+            }
+
+            regionID = UUID.Zero;
+            position = Vector3.Zero;
+            lookAt = Vector3.Zero;
+            return false;
+        }
+
+        #endregion Helpers
+    }
+}