Colibri

Open source chat platform built on the AT Protocol for communities, with text channels, voice channels, and video calls

Colibri is an alternative to

Discord is a centralized communication platform for text, voice, and video chat organized into community servers.

Slack is a centralized team communication platform for messaging, file sharing, and collaboration in organized channels.

Microsoft Teams is a centralized communication and collaboration platform for chat, video calls, and file sharing in organized workspaces.