O Google Talk usa o protocolo padronizado XMPP (Jabber) ; O seguinte é uma lista completa dos clientes de mensagens instantâneas nos repositórios do Ubuntu que devem apoiar o Google Talk.
Por favor note que alguns destes são clientes de linha de comando (console); Eu destaquei os que eu sei são gráficos (ou GUI) em negrito:
ayttm - Universal instant messaging client barnowl - A curses-based tty Jabber, IRC, AIM and Zephyr client centerim - A text-mode multi-protocol instant messenger client ekg2 - instant messenger and IRC client for UNIX systems finch - text-based multi-protocol instant messaging client freetalk - console based Jabber client gajim - Jabber client written in PyGTK jwchat - a full featured, web-based Jabber chat client kadu - Gadu-Gadu/XMPP client for X11 kopete - instant messaging and chat application licq - multi-protocol instant messaging client (base files) licq-plugin-jabber - Jabber plug-in for Licq mcabber - small Jabber (XMPP) console client pidgin - graphical multi-protocol instant messaging client for X psi - Jabber client using Qt psi-plus - Qt-based jabber client (basic version) qutim - multi-protocol instant messenger sendxmpp - commandline XMPP (jabber) utility tkabber - GUI client for XMPP (Jabber) instant messaging protocol