Connection Managers
Stable
Gabble: A Jabber/XMPP connection manager that handles single- and multi-user chats and voice/video calls. Darcs repository; releases
Salut: A link-local XMPP connection manager (XEP-0174). CategorySalut; Darcs repository; releases
Idle: A full-featured IRC connection manager. Darcs repository; releases
Telepathy-SofiaSIP: A SIP connection manager based around the Sofia-SIP library. Darcs repository; SF.net project page.
Under Development
Haze: A connection manager based on Pidgin's libpurple, supporting all protocols in Pidgin (AIM, ICQ, Yahoo, MSN, etc) at a basic level, but already very usable. Details available on Pidgin wiki. Darcs repository, releases
Butterfly: An MSN connection manager that handles presence, conversations, avatars, personal messages, server-side aliases, and full contact management (including groups). Requires pymsn and TelepathyPython. Bzr repository; releases
Deadish
Wilde: An AOL/ICQ (Oscar) connection manager, this handles single direct messaging, presence, conversations and simple buddy list (add/remove). Audio calling is coming RSN. Darcs repository
Clients
Ereseva: VOIP-capable webphone, based on tapioca-python and GTK+ libraries. (Ereseva SVN repository)
Empathy: a Gnome IM/voice/video client reusing Gossip's UI and using Nokia's Mission Control
Dead?
Landell: a GNOME Instant Messenger built around Tapioca# (C#/Mono)
Cohoba: a UI for GNOME desktops by Raphaël Slinckx (Python)
GnomeUI: an experimental UI for Gnome desktops by Adam Lofts (C#/Mono)
Banter: a Gnome IM/voice/video client with a rich user interface (C#/Mono)
Tools
Telepathy Inspector: A telepathy client (GTK+) whose objective is to expose all interfaces and functionalities implemented by a given connection manager along with its connections, channels, etc.
Libraries
Telepathy Python: Python libraries for use in Telepathy clients (e.g. Cohoba) and connection managers (e.g. Butterfly)
TelepathyQt: Qt4 libraries for use in Telepathy clients and connection managers
TelepathySharp: A .NET library for use in Telepathy clients
TapiocaQt: A high-level Qt4 library on top of TelepathyQt for use in Telepathy clients (e.g. decibel, kopete)
TapiocaSharp: A high-level .NET library on top of TelepathySharp for use in Telepathy clients (e.g. landell)
Telepathy GLib: A GLib-based helper library for clients and connection managers
libtelepathy: A GLib library to ease writing Telepathy clients in glib; deprecated in favour of Telepathy GLib. Darcs repository; releases
Other Components
Mission Control: Control the launching of connection managers and clients. Sources available on Mission Control website
Stream engine: A Telepathy client that uses Farsight and GStreamer to handle media streaming for channels with the MediaSignalling interface. Darcs repository; releases
telepathy-feed: A Galago feed for Telepathy. http://telepathy.freedesktop.org/releases/telepathy-feed
2006 Summer of Code projects
Antoine Perdaens is working on a OSCAR protocol implementation, adding Audio and Video presence and conferencing negotiation - OscarSOC