Monitorix is a free, open source, lightweight system monitoring tool designed to monitor as many services and system resources as possible.
SABnzbd Plus is a free/open-source cross-platform binary newsreader written in Python.
Sonarr is a PVR for Usenet and BitTorrent users. It can monitor multiple RSS feeds for new episodes of your favorite shows and will grab, sort and rename them.
OpenDocMan is a full featured Web-based document management system designed to conform to ISO 17025/IEC.
Collabtive is web-based project management software. The project was started in November 2007.
PHP Server Monitor is a script that checks if your websites and servers are up and running. Manage users for each server with a mobile number and email address.