IM+ is described as 'One app for all your messaging' and is a very popular instant messenger in the social & communications category. There are more than 50 alternatives to IM+ for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best IM+ alternative is Signal, which is both free and Open Source. Other great apps like IM+ are Telegram, Element, Pidgin and Tox.
Kaidan is a simple, user-friendly Jabber/XMPP client providing a modern user interface using Kirigami and QtQuick. The back-end of Kaidan is written in C++ using the QXmpp XMPP client library and Qt 5.
Brosix is a secure communication tool for businesses that need a functional way to organize their internal communication.
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 username.
Chat on the Jabber network (XMPP protocol); focus on features for gateway users The Cheogram Android app allows you to join a worldwide communication network.
qutIM - free open-source multiprotocol ( ICQ, Jabber/GTalk/Ya.Online/LiveJournal.com, Mail.Ru, IRC )
Messenger for Desktop is a wrapper for the official client messenger.com. Therefore it works like a regular browser which can only navigate to the messenger.com web app. MFD doesn't touch your messages, account or personal data. All that is handled securely by Facebook.
Technitium Mesh is a secure, anonymous, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. Primary aim of developing this instant messenger is to provide privacy which is achieved using cryptography and anonymity using Tor network.
Ayttm is an instant messaging (aka chat) client that provides all-in-one chat functionality for several major instant messaging services from one simple program. Ayttm "Contacts" allow you to refer to several accounts of the same person from a single contact name...
BBM Enterprise enterprise messenger offers faster communication, collaboration and decision making while providing enhanced security over corporate data.
BeagleIM is a lightweight and powerful XMPP client developed by Tigase, Inc. It provides an easy way to start using the XMPP Protocol (formerly known as Jabber) if you've never used it before. Veterans of the protocol will find many features here they are familiar.
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