Slack AlternativesOnly apps categorised as Instant Messengers - Page 7

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.

0xchat is a secure chat app built on the Nostr protocol. It prioritizes security, featuring private key login, encrypted private chats and contacts, encrypted group chats.

PeerSuite is an open source, decentralized, private alternative to apps like Discord or Slack. All data is sent only between clients through encrypted WebRTC channels.

With Instaforum, you can build a forum website that's as simple and usable as a modern messaging app. It can be public or private, and users don't have to install anything. It's easy to set up, runs on your domain with your branding, and you control your data.

Dirc is a peer-to-peer web application which uses WebRTC to set up connections between chat participants without requiring a back-end server. The static files can be self-hosted. Other features:

Secure self-hosted messenger with private and group chat rooms, file transfer and storage, voice and video meetings, meetings recording, issue tracking, screen sharing and remote control, flexible permissions, and many more.

TrueConf Server is used by 5000 companies around the world connecting thousands of workplaces and conference rooms. The server is specially designed to work in your corporate network. Deploying TrueConf Server takes only 15 minutes!