Telegram
Free
Telegram is a free cloud-based instant messaging platform.
Jitsi
Open Source
Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.
LINE
Freemium
LINE is a new communication app which allows you to make free voice calls and send free messages whenever and wherever you are.
Shout
Open Source
Shout is a self-hosted web IRC client.
Trillian
Freemium
Trillian is a proprietary multiprotocol instant messaging application.
Facebook Messenger
Free
Facebook Messenger is the official Facebook app that lets you have text conversations with all of your friends on the popular social network.
ICQ
Free
ICQ is an open source instant messaging software.
Compare IM+ with alternatives
Compare Facebook Messenger and IM+ and decide which is most suitable for you.