Trillian is described as 'Instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation should be easily shared between all of your devices, not trapped as text messages on your phone' and is a very popular instant messenger in the social & communications category. There are more than 100 alternatives to Trillian for a variety of platforms, including Android, iPhone, Mac, Windows and Linux apps. The best Trillian alternative is Signal, which is both free and Open Source. Other great apps like Trillian are Element, Pidgin, Tox and SimpleX Chat.
Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
The Steam Chat app includes many key features of the desktop Steam client chat, including:
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.
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...
Offers free global video and voice calling, group chat with up to 50 participants, in-app messaging that bypasses SMS plans, music clip sharing via Spotify, photo editing, gaming and gifts, animated messages, mini-games during calls, and centralized media gallery.
Brosix is a secure communication tool for businesses that need a functional way to organize their internal communication.
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.
FaceFlow is a free web-based application for video calling and group video calling. It also offers additional features such as chat rooms.
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