Pidgin is succesor of GAIM, yeas this is new name of Gaim. So what is Pidgin? Pidgin is a multiprotocol instantaneous customer of transmission of messages which allows you to employ all your accounts IM immediately. Formerly known as “a GAIM” (named change due to the legal reasons), with GAIM being included in the many Distro Linux Distribution installation
Go to MBHoy.com for more detail about it.