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.
Feature-rich XMPP client for advanced users offering strong customization options, secure encrypted messaging (TLS, OpenPGP, OTR, OMEMO), file transfers, audio/video calls, support for animated emoticons, modern themes, group messaging, and multi-platform compatibility.
An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features.
LINE is transforming the way people communicate, closing the distance between family, friends, and loved ones for free.
The goal of Gajim is to provide a full featured and easy to use XMPP client. Gajim works nicely with GNOME, but does not require it to run. It is released under the GNU General Public License.
WeChat is a complete mobile communication and private social networking app. Free, cross-platform, and full-featured, WeChat is the best way to keep in touch with everyone you care about.
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 services and do all your chatting within one application.
Kopete is an instant messenger supporting AIM, ICQ, Jabber, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable for personal and enterprise use.
Instantbird is an instant messaging client based on Mozilla XULRunner and the open source library libpurple created by the software developers of Pidgin . Over 250 add-ons allow user customization of, and addition of, features.
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