Alternatives to iChat for all platforms with any license

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
Video Conferencing SIP Share your screen No installation required ... Privacy-friendly Browser based Cross-platform Encryption End-to-End Encryption Live Meeting Support for Multiple protocols No download No Login Required No registration required Privacy focused SIP client Unlimited users Web-Based Desktop Sharing File sharing Group chat iPhone/iPod sync Multiple Account support OTR Plugins SIP Softphone Video calling Video chat Video Conferencing Voice chat WebRTC Xmpp Add a feature

422 Like
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
Share your screen Video calling Gmail integration Group chat ... Multi Device Support Sms from PC Syncs with gmail Video Conferencing Desktop app Share your screen SMS Messaging Supports archiving conversations Video chat Voice Call Voice messages WebRTC Add a feature

1027 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
Facebook integration IRC Messages Messaging ... Support for Multiple protocols POP3 Support Team Collaboration Xmpp Add a feature

276 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 Customizable Facebook ... Messages 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 ... Chrome OS Android Tablet iPad Apple Watch
People nearby Stickers Group chat IFTTT integration ... Public groups chat Video calling Voice Call Voice chat Add a feature

104 Like
Kik

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 numbers, just pick a...

Free Android iPhone Kindle Fire
Chat Bot GIF support Group chat Add a feature

54 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

17 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 Support for Multiple protocols OTR Supports XMPP ... Video calling Voice Call Add a feature

27 Like
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FaceFlow

FaceFlow is a free web-based application for video calling and group video calling. It also offers additional features such as chat rooms.

Freemium Web Blackberry 10
Video calling Video chat Add a feature

10 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
Desktop app Video calling Voice Call Voice chat Add a feature

54 Like