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.
Twake is a real-time teamwork platform. It is a suite of collaborative tools that includes the specificities of some bestsellers (Slack, Trello, Google Drive...). We provide professional messaging, storage space, online collaborative editors (Words, Excel, PowerPoint), task...
Decentralized social and blog platform based on XMPP, enabling self-hosting, cross-network chat, video calls, and group collaboration. Users control and migrate their data, communicate across various networks, and access services from any node while preserving privacy and open-source principles.
The best Discord alternative. Mezon is a Live, Work, and Play platform. It’s perfect for gaming and chilling with friends, or even building a global community. Customize your own space to talk, play, and hang out.
A comprehensive collaboration platform within Office 365, providing centralized chat, file sharing, and HD video meetings. Accessible on multiple platforms, it offers enterprise-grade security and compliance, customizable notifications, and private to group chat sessions.
Free, privacy-focused chat platform for gaming communities offering servers, channels, roles, low-latency voice, video, screen sharing, 5GB uploads, message translation, end-to-end encrypted DMs and calls, forum features, calendar events, and no paid tiers.
Decentralized chat platform built on the nostr protocol with support for multi-group communities, event calendars, threads, private messaging, web of trust, customizable access controls, monetization via zaps, full privacy, and white-label options for branding.
Powered by WebRTC, Real-time video call, chat room and screen sharing entirely browser based.
An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features.
Free, browser-accessed community platform with real-time text chat, voice and video calls, topic channels, encrypted direct messages and files, easy email sign-up, member and staff controls, invite links, moderator audit log, and full privacy settings.
Ripcord is a desktop chat client for group-centric services like Slack and Discord. It provides a traditional compact desktop interface designed for power users. It's not built on top of web browser technology: it responds quickly to input, sips gently from computer...
Secure team messaging platform with organized topic-based conversations, real-time collaboration on Docs, Sheets, Slides, integrated calendar scheduling, one-click meetings, shared tasks and files, Google Workspace support, admin controls, compliance, and advanced search.
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Teams is not Opensource. Mattermost is.