Outlook.com is a free personal email service from Microsoft.

Empathy is an instant messaging (IM) and voice over IP (VoIP) client which supports text, voice, video, file transfers, and inter-application communication ov…

AIM is a instat messenger application.

Trillian is a proprietary multiprotocol instant messaging application.

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

Facebook Messenger is the official Facebook app that lets you have text conversations with all of your friends on the popular social network.

Miranda NG is a successor of Miranda IM, a popular multi-protocol instant messaging client for Windows.

Franz is a free messaging app /former emperor of Austria, that combines chat & messaging services into one application.

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