Short Review: Pidgin is Multi Protocol Instant Messenger Client that supports AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. For further information about Pidgin you can read my article discussing Pidgin here.
Portable Pidgin is Pidgin Chat Client that designed works with portable devices without need to install to run it or use it. Just run from the portable device where the pidgin portable file exist then you can use Pidgin just like you use official Pidgin …

GAIM, in the past is the name of the Pidgin Multi IM Client. Right now it turn into Pidgin. Just like Miranda IM, Pidgin is Multi Protocol Chat Client that support most of Messenger Services. That means you can login and use your account from Yahoo, Windows Live, Google, and other to chat using Pidgin.
Pidgin Supports AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. You can also install a lot of plugin to make Pidgin …