Zulip : Powerful slack-like open source group chat
Commento : A lightweight, open source, tracking-free comment engine alternative to Disqus.
ProjectPier.org : ProjectPier is a Free, Open-Source, PHP application for managing tasks, projects and teams through an intuitive web interface. It must be downloaded a...
Cachet : Beautiful & simple service statuses. The open source status page system, for everyone.
Mailtrain : Mailtrain is a self hosted newsletter application built on Node.js (v5+) and MySQL (v5.5+ or MariaDB). Mailtrain supports subscriber list management, ...
