Nekogram
Nekogram is an open-source third-party Telegram client with not many but useful mods.
HexChat is an IRC client based on XChat for Linux , but unlike XChat it’s completely free for both Windows and Unix-like systems.HexChat was originally called XChat-WDK which in turn was a successor of freakschat.FeaturesEasy to use and customizable interfaceCross-platform on Windows, OS X, and Unix-like OSesHighly scriptable with Python and PerlTranslated in multiple languagesFully open source and actively developedMulti-network with auto-connect, join, and identifySpellcheck, Proxies, SASL, DCC support and more
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YAATA SMS
YAATA is influenced by the true spirit of Android. It is a SMS/MMS app that has so much to offer. You can personalize and configure this app to your definition of the perfect app. YAATA SMS is very powerful, reliable and the speed of the app is on another level.
Nagram
The third-party Telegram android app.
AtomJump.com
AtomJump.com is a well tuned hosted version of the free open-source AtomJump.org. It is free to chat publicly with your family, group or co-workers on your own group.
iMe Messenger & Crypto Wallet
An unofficial client developed on the Telegram open source and working on Telegram API.
Wiki on a Stick
Wiki on a Stick (in short WoaS) is a wiki that lives in one self-modifying XHTML file. Its perfect to be used at home or at office, on your laptop or USB pen drive (along with Portable Firefox if you want) and even in a floppy disk!
Smoke Crypto Messenger
Smoke Messenger is an open-source Instant Messenger that is known as the first mobile Messenger worlwide using the encryption algorithm McEliece. To be downloaded at F-Droid.org or Github.com.Smoke provides with its own Server-Software: SmokeStack-Echo-Server.
TeXmacs
GNU TeXmacs is a free scientific editing platform designed to create beautiful technical documents. It provides a unified and user friendly framework for editing structured documents with different types of content: text, math, graphics, slides, etc.