Mattermost is described as 'Self-hosted platform for chat, workflow automation, voice calls, screen sharing, AI-powered features, third-party integrations, and team messaging' and is a very popular Group Chat app in the social & communications category. There are more than 100 alternatives to Mattermost for a variety of platforms, including Web-based, Android, iPhone, Windows and Mac apps. The best Mattermost 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 Mattermost are Stoat Chat, Slack, Zulip and Element X.
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.
Priority Matrix software helps managers prioritize, focus, and work smarter. It allows you to seamlessly communicate team priorities and keep track of the moving parts of your projects, promoting accountability and clarity across multiple platforms.
Mostlymatter is a fork of Mattermost meant to remove the users and messages limits. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle.
kChat is a secure instant messaging for businesses, which makes it possible to discuss matters live and organise projects.
hack.chat is a minimal, distraction-free chat application. Channels are created and joined by going to https://hack.chat/?your-channel. There are no channel lists, so a secret channel name can be used for private discussions.
Source code : https://github.com/hack-chat/main.
Ryver provides all of your team communications in one place: chats, posts, and files. Invite as many team members and guests as you need.
Open source encrypted group-chat platform focused on privacy and efficiency, featuring Rust-based backend for speed, customizable interface, minimal data collection, real-time messaging, community-driven improvements, and ergonomic design for various use cases.
Teams.cc is a communication application for increasing team collaboration that you can install on your PC or mobile device. This software has the ability to revolutionize the way you collaborate due to its unique functionalities.
Kahla is a free and open-source, cross-platform business messaging tool that supports end-to-end encrypted message communication and automatic destruction of messages.
AirSend is a simple collaboration space for professionals and small teams that brings all your conversations, files, notes, and to-do lists into one place so that you can get work done faster and easier.
It is cloud hosted and free
Roomy creates rooms of sociality. Digital places for friends and collaborators to hang out in. Roomy is a lot more than 'group chat', but we do believe group chat is minimum viable everything, as it's the best default foundation for greenfield community building and...
United States
Switzerland
easy to use, completely online and can create fully private channels with files, wiki and work items.