Hangouts Plugin for libpurple is a replacement purple for hangouts in Pidgin/libpurple to support the proprietary protocol that Google uses for its Hangouts service. So far it supports all the fun things that aren't part of the XMPP interface, such as Group Chats, synchronised history between devices and SMS support via Google Voice. WWW: https://bitbucket.org/EionRobb/purple-hangouts