Mumble is described as 'Open source, low-latency voice chat offering high quality audio, secure encryption, self-hosting, in-game overlays, positional audio, and granular permissions' and is a very popular Group Chat app in the social & communications category. There are more than 50 alternatives to Mumble for a variety of platforms, including Web-based, Windows, Android, Linux and iPhone apps. The best Mumble alternative is Element. It's not free, so if you're looking for a free alternative, you could try Element or Discord. Other great apps like Mumble are TeamSpeak, Element X, Echoed and Mirotalk.
Conduit is a simple, fast and reliable chat server powered by Matrix. Conduit is an alternative to Synapse and tries to be lightweight and easy to install, but it is still in development.
Mycelium (formerly Disclone) is a feature-rich, open source communication app and personal-collaborative hub (drive/notes...).
The application is a push-to-talk (PTT) walkie-talkie for consumers and business and available for Android, iOS, Blackberry, Windows Phone, Windows PC, rugged mobile devices and two-way radios.
FluxCap is an independent desktop client designed to connect seamlessly with the Fluxer network. Built with Electron, it provides a dedicated, fast, and customizable user interface for Windows, taking Fluxer out of your browser and directly onto your desktop.
This simple Matrix client written in Python allows you to send and receive messages and files, verify other devices, and interact with your Matrix account or other Matrix users in many ways. You use it from the terminal (CLI) or integrate it into other simple Python programs.
SadnessChat SadnessChat is a free, real-time chat platform built for real conversations. Whether you're hanging out with friends or building a community, SadLounge has everything you need.
Small program mainly aimed to provide a simple user interface for making VoIP calls with Asterisk PBX (an open source VoIP PBX).
Make video calls to anybody in the world with a private connection. Share the conversation by sharing url.
C3 is a standalone voice and text chat application built specifically for gamers for a better overall gaming experience. Instant setup and easy channel sharing lets players spend more time communicating and less time memorizing port and server information.
ReaLiveT is a free, elegant and simple tool that helps you to communicate immediately with a group of people. Designed for players who play in an online world. Also, a social network to chat with another people and meet new people around the world.
Communicating with your teams over push to talk, instant messaging and sharing files and Monitor employee location, work hours with clock-in/out, track work status, assign tasks and enable organization-wide unified contact management.
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