Best Self-Hosted Communication Apps

Rocket.Chat Communication

Active

Open-source team communication

Replaces Slack, Microsoft Teams

Mattermost Communication

Active

Secure collaboration for developers

Replaces Slack, Microsoft Teams

Nextcloud Files & Storage

Active

Self-hosted content collaboration platform for files, calendar, contacts, and office docs — a private cloud for individuals and teams.

Replaces Google Drive, Dropbox, Microsoft 365

Gotify Communication

Active

Simple self-hosted server for sending and receiving push notifications over WebSocket.

Replaces Pushover, Pushbullet

Cachet Monitoring & Dashboards

Stale

Open-source, self-hosted status page system for communicating incidents and uptime.

Replaces Atlassian Statuspage