Feedbin : Feedbin is an open source web based RSS reader. It provides a user interface for reading and managing feeds as well as a REST-like API for clients to ...
Gitea : Gitea is a community managed fork of Gogs, lightweight code hosting solution written in Go and published under the MIT license.
Kinto : Kinto is a lightweight JSON storage service with synchronisation and sharing abilities.
Zulip : Powerful slack-like open source group chat
Commento : A lightweight, open source, tracking-free comment engine alternative to Disqus.
GitLab is a web-based Git repository manager with wiki and issue tracking features. GitLab offers hosted accounts similar to GitHub, but also allows its software to be used on third party servers.