Trillian is a proprietary multiprotocol instant messaging application.

Choqok is a Free, Open Source micro-blogging client for K Desktop Environment.

Smuxi is a cross-platform IRC client for the GNOME desktop inspired by Irssi.

AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.

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

Postfity is a post scheduling tool for social networks.