PushBits

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

Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and...

Notification server with Android and CLI clients

Server for [Matrix](https://matrix.org/), an open standard for decentralized persistent...

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

Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls...