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.
HD video and audio meetings for up to 250 participants with real-time captions, international dial-in, screen and presentation sharing, secure browser-based access, calendar scheduling, chat messaging, file sharing, and adaptive video quality for remote teams.
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.
Sphinx.chat lets you use your lightning node to talk to anyone else who is running lightning and a sphinx compatible chat client.
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.
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.
Miranda New Generation is a successor of a popular multi-protocol instant messaging client for Windows - Miranda IM . Very light on system resources and extremely fast.
Secure self-hosted platform unites private and group messaging, voice and video meetings, meeting recording, file transfer, issue tracking, screen sharing, remote control, and flexible permissions for on-premises collaboration in both corporate and personal use cases.
TeleGuard is the data-secure messenger from Swisscows. TeleGuard encrypts every message and all telephone calls with encryption algorithm currently available: SALSA 20. TeleGuard servers are located in Switzerland, they are not subject to the data protection laws of the EU /...
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).
Tinode is the most popular SaaS alternative to Trillian.
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