Add ReleaseBell

ReleaseBell was written after Sibbell got discontinued.

README.md

@@ -930,6 +930,7 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
 - [nnmm](https://nnmm.nl/) - Super tiny pastebin/url minifier "microservice". ([Source Code](https://github.com/Mechazawa/nnmm)) `Beerware` `PHP`
 - [Notica](https://notica.us) - Lets you send browser notifications from your terminal to your desktop or phone. No installation or registration is required. ([Source Code](https://github.com/tannercollin/Notica)) `MIT` `Nodejs`
 - [Ombi](https://ombi.io/) - A content request system for Plex/Emby, connects to SickRage, CouchPotato, Sonarr, with a growing feature set. ([Demo](https://demo.ombi.io/), [Source Code](https://github.com/tidusjar/Ombi)) `GPL-2.0` `C#`
+- [ReleaseBell](https://releasebell.com/) - Send release notifications for starred Github repos. ([Source Code](https://git.cloudron.io/cloudron/releasebell)) `MIT` `Nodejs` 
 - [revealjs](https://revealjs.com) - Framework for easily creating beautiful presentations using HTML. ([Demo](https://revealjs.com/), [Source Code](https://github.com/hakimel/reveal.js)) `MIT` `JavaScript`
 - [SANE Network Scanning](http://sane-project.org/) - Allow remote clients to access image acquisition devices (scanners) available on the local host. ([Source Code](http://www.sane-project.org/cvs.html)) `GPL-2.0` `C`
 - [Trello Burndown](https://github.com/swordbeta/trello-burndown) `⚠` - Easy to use SCRUM burndown chart for Trello boards. `MIT` `Go/Docker`