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Mattermost
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).
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Open source
Self-hostable
AGPL-3.0
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ntfy
Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
Apache-2.0
GPL-2.0
+3
Answer
Knowledge-based community software. You can use it to quickly build your Q&A community for product technical support, customer support, user communication, and more.
Apache-2.0
Docker
+1
Centrifugo
Language-agnostic real-time messaging (Websocket or SockJS) server.
MIT
Go
+2Continuwuity
Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit).
Apache-2.0
Rust
+3
GoToSocial
ActivityPub federated social network server implementing the Mastodon client API.
AGPL-3.0
Docker
+1
SIPCAPTURE Homer
Troubleshooting and monitoring VoIP calls.
AGPL-3.0
Nodejs
+2