Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols.

Instantbird is a cross-platform instant messaging client based on Mozillas XULRunner and the open source library libpurple used in Pidgin.

AdiInviter Pro is a contact importer and tell-a-friend platform.

Miranda IM is an open source multiprotocol instant messaging application, designed for Microsoft Windows.

MailStore lets you archive your private email from almost any email source and search through them extremely quickly.