Centrifugo

Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.

Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).

Communications platform that puts data protection first (alternative to Gitter.im and Slack).

Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.

Notification server with Android and CLI clients (alternative to PushBullet).

Customer communication platform (alternative to Intercom and Zendesk).