Alternatives to Iwantim for all platforms with any license

Pidgin

Pidgin is an easy to use, multi-protocol chat client client used by millions. Connect to AIM, MSN, Yahoo, XMPP, and more chat networks all at once. It has built-in...

Free Open Source Mac Windows Linux BSD PortableApps.com ... Xfce
Multiple protocols Multiple protocols support Extensible by Plugins/Extensions Supports XMPP ... Multiple languages Multiple Account support Multiple chat protocols Portable Video calling Voice Call Add a feature

1439 Like
Jitsi

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

Free Open Source Mac OS X Windows Linux Web Android ... BSD
End-to-end encryption Group chat iPhone/iPod sync Multiple protocols ... Multiple Account support OTR Video calling WebRTC Add a feature

275 Like
Facebook Messenger

Facebook Messenger is a faster way to message. Reach friends right on their phones, get and send messages fast, message everyone at once and more. Top Features: •...

Free Windows Web Android iPhone Blackberry ... Windows S Android Tablet Windows Phone iPad Apple Watch Android Wear
Group chat In-app Money Transfer Video calling Voice Call Add a feature

188 Like
Franz

Franz is a free messaging app / former Emperor of Austria and combines chat & messaging services into one application. Franz currently supports Slack, WhatsApp...

Freemium $ $ $ Open Source Mac Windows Linux
Multiple protocols Gitter integration Gmail integration iPhone/iPod sync ... Lightweight wrapper Multiple Account support Slack integration Unified messaging Web application wrapper Add a feature

87 Like
Imo

Message and video chat with your friends and family for free. Features - Make high-quality video and voice calls on Android and iPhone - Send unlimited messages...

Free Windows Android iPhone Android Tablet iPad
Push to talk Video calling Voice Call Voice messages Add a feature

208 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 OS X Windows Linux Web Android ... iPhone Blackberry iPad
Facebook integration Multiple protocols POP3 Support Team Collaboration Add a feature

270 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
Customizable Multiple languages Multiple protocols OTR ... Supports XMPP Tabbed interface Support for Themes Add a feature

329 Like
Empathy

Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those...

Free Open Source Linux BSD
Built-in File transfer Multiple protocols Video calling Add a feature

154 Like
- Discontinued Empathy is currently unmaintained. Last version, 3.25, released in August 2017, can be still downloaded from the official website.
Miranda IM

Miranda IM is the smaller, faster, easier instant messenger with support for multiple protocols. Designed from the ground-up to be resource efficient while still...

Free Open Source Windows PortableApps.com
Multiple protocols Portable Add a feature

223 Like
IM+

Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Google Talk, AIM, Jabber, ICQ, Facebook, MySpace and Twitter on ALL...

Freemium Web Windows Mobile Android iPhone Java Mobile ... S60 HP webOS Blackberry Android Tablet Windows Phone iPad Kindle Fire
Multiple Account support Multiple protocols support Add a feature

103 Like
Messenger for Desktop

A simple & beautiful app for Facebook Messenger. Chat without distractions on any Operating System.

Free Open Source Mac OS X Windows Linux
No features added Add a feature

9 Like
- Bundleware Be careful during the installation: https://alternativeto.net/discussions/applications/11718/be-careful-in-the-installation/
Disa

Disa is your new messaging hub. Conversations from different services can seamlessly be joined together, or disbanded within seconds.

Free Android Android Tablet Kindle Fire
Extensible by Plugins/Extensions Texting Unified messaging Add a feature

19 Like
Kopete

Kopete is an instant messenger supporting AIM, ICQ, MSN, Yahoo, Jabber, IRC, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and...

Free Open Source Mac OS X Linux BSD
No features added Add a feature

68 Like
qutIM

qutIM - free open-source multiprotocol ( ICQ, Jabber/GTalk/Ya.Online/LiveJournal.com, Mail.Ru, IRC ) instant messenger for Windows, Linux, MacOS X, OS/2, Symbian...

Free Open Source Mac OS X Windows Linux S60 BSD ... Haiku
Multiple protocols Add a feature

27 Like
- Discontinued The project seems to be no longer developed. Last versions for Windows, Mac, Linux and other platforms can be still downloaded from the official website.
Fire

Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries for each service. Currently Fire handles AOL Instant Messenger®...

Free Open Source Mac OS X Linux BSD
Multiple protocols Add a feature

1 Like
- Discontinued The project is no longer developed. Last version, 1.5.6, released in February 2006, can be still downloaded from SourceForge.