There are free software implementations of various protocols that export Telepathy interfaces:

• Gabble: for XMPP, including support for Jingle
• Butterfly: for Windows Live Messenger
• Idle: for Internet Relay Chat
• Salut: for the link-local XMPP protocol
• Haze: for accessing protocols supported by libpurple, the library used by the Pidgin messaging client. This was done as a Google Summer of Code project in 2007.^[1]
• Spirit: for the Skype protocol on the Nokia N900 and Nokia N9
• Rakia: for the Session Initiation Protocol (SIP), using Nokia's open source Sofia-SIP library
• Morse: for Telegram

Mission Control is the name of the component that provides a way for end-user applications to abstract some details of low level telepathy components such as connection managers.^[2]

Tubes are Telepathy's mechanism for supporting arbitrary data transfer and remote IPC.^[3]

Telepathy forms the basis of the instant messaging and voice/video calling software on the Nokia 770, N800, N810, N900, N9 and Jolla.

Protocol implementations provide a D-Bus service called a connection manager. Telepathy clients use these to create connections to services. Once a connection is established, further communication happens using objects called channels which are requested from the connection. A channel might be used to send and receive text messages, or represent the contact list, or to establish a VoIP call.

• Empathy
• KDE Telepathy
• Sugar

• Farstream (formerly Farsight)

• Project website
• "IM/VOIP Communications Framework" video download (77MB ogg) of talk by lead developer Robert McQueen on Telepathy. Streaming Flash video.
• KDE-Telepathy actual 0.9.0
• Telepathy Developer's Manual