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.
Spark is an Open Source, cross-platform IM client optimized for businesses and organizations. It features built-in support for group chat, telephony integration, and strong security. It also offers a great end-user experience with features like in-line spell checking, group chat...
monocles chat is a fork of blabber.im and Conversations with some changes, to improve usability.
AstraChat is a standalone and lightweight Jabber (XMPP) client application for mobile and desktop that connects directly to your XMPP server without any proxies in-between.
Spotbros is an app where you can discover and share all types of content through public chat groups (Spots) or with your friends through private chats.
R&Q is a little instant messaging client for the ICQ protocol, fork of Rejetto's &RQ. It is simple, fast, takes a little more than 1 MB disk space and doesn't need setup.
emesene is an instant messenger capable of connecting to various networks and utilizing different graphical toolkits. Currently msn and jabber are supported through papyon and xmppy, which allows emesene to connect to various IM services such as GTalk, Facebook Chat, etc.
Zom's security and privacy features are powered by the amazing foundation created by the ChatSecure project, and works with other great apps like Conversations.
Kadu is an open source Jabber/XMPP and Gadu-Gadu instant messenger client for Linux, *BSD, Mac and Windows.
MCabber is a small XMPP (Jabber) console client. It includes features such as SASL/SSL/TLS support, MUC (Multi-User Chat) support, history logging, command completion, OpenPGP encryption, OTR (Off-the-Record Messaging) support, dynamic modules and external action triggers.
CenterIM is a text-mode IM client for Linux, *BSD, Solaris and other Unices that uses libpurple as a communication backend.
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Spark is an email app, not an IM app.