Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.

Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.

1Click is a B2C online software which offers video, voice and text chat with collaborative features screen sharing and conversation recording.

WhatsApp Messenger is an instant messaging platform owned by Facebook.

Yahoo! Messenger (sometimes abbreviated Y!M) is an advertisement-supported instant messaging client and associated protocol provided by Yahoo.