Alternatives to iChat for all platforms with any license

Hangouts

Hangouts is a messaging app that lets you send and receive messages, photos and more, and even start free video and voice calls – one to one or with a group! ...

Free Windows Web Android iPhone Chrome OS ... Android Tablet iPad Chrome Android Wear
Video calling Share your screen Gmail integration Group chat ... Multi Device Support Sms from PC Video Conferencing Multi-platform support Share your screen SMS Messaging Supports archiving conversations Video chat Voice Call Voice messages WebRTC Add a feature

1012 Like
Jitsi

Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live...

Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet BSD iPad
SIP Video Conferencing Privacy-friendly Security & Privacy ... Browser based Chat Cross-platform Desktop Sharing File sharing Group chat iPhone/iPod sync Live Meeting Support for Multiple protocols Multiple Account support No download No installation required No Login Required OTR Plugins Privacy focused Share your screen SIP Softphone Unlimited users Video calling Video chat Video Conferencing Voice chat WebRTC Xmpp Add a feature

365 Like
Trillian

Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation...

Freemium Mac Windows Linux Web Android ... iPhone Blackberry iPad
Chat Facebook integration IRC Messaging ... Support for Multiple protocols POP3 Support Team Collaboration Twitter Xmpp Add a feature

277 Like
Adium

Adium is a free and open source instant messaging application for Mac OS X, written using Mac OS Xs Cocoa API, released under the GNU GPL and developed by the Adium...

Free Open Source Mac
Support for Multiple protocols Xmpp Chat Customizable ... Messaging Multiple languages OTR Supports XMPP Tabbed interface Support for Themes Add a feature

334 Like
LINE

LINE is a Japanese proprietary application for instant messaging on smartphones and PCs. Line users exchange text messages, graphics, video and audio media, make free...

Freemium Mac Windows Web Android iPhone ... Blackberry Android Tablet Windows Phone iPad Apple Watch
Stickers Group chat IFTTT integration Public groups chat ... Video calling Voice Call Voice chat Add a feature

102 Like
Kik

Get connected. Kik is way more than just messaging. It’s the easiest way to connect with your friends, stay in the loop, and explore – all through chat. No phone...

Free Android iPhone Kindle Fire
Group chat Share Videos Add a feature

51 Like
Psi+

A development branch of the Psi XMPP client. Psi is a cross-platform powerful XMPP client (Qt, C++) designed for the XMPP power users.

Free Open Source Mac Windows Linux BSD
Xmpp Chat Support for Multiple protocols OTR ... Supports XMPP Video calling Voice Call Add a feature

27 Like
Zello

The application is a push-to-talk (PTT) walkie-talkie for consumers and business and available for Android, iOS, Blackberry, Windows Phone, Windows PC, rugged mobile...

Free Personal Windows Windows Mobile Android iPhone Blackberry ... Windows Phone
Radio Gateway Lightweight Message Replay Multiple languages ... Push to talk Trending Channels Unlimited Channel Size Voice chat Add a feature

16 Like
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Tango

Tango allows you to easily connect with friends & family or make new friends. Make video & voice calls, send text messages, play games, send music messages...

Freemium Android iPhone Android Tablet iPad
Meet new people Photo Sharing Video calling Voice Call Add a feature

27 Like
Fring

Fring is a VoIP (voice over internet) app that allows you to make 2-way video calls, voice calls and live chat for free, from your phone or iPod. It offers video...
- Discontinued
  The apps seem to be no longer updated. Last versions, released in February 2014, can be still downloaded from the appstores.
Freemium Android iPhone
Video calling Voice Call Voice chat Add a feature

54 Like