Sourcemon is a web-based monitoring tool for valve source servers (like CS:GO or Garry's Mod). It uses the valve-python module to query any source server for data.
git clone https://github.com/michaelimfeld/sourcemon.git
bower install
debuild -us -uc
dpkg -i ../sourcemon_1.0_amd64.deb
sudo service sourcemon start
Navigate your browser to localhost:5000 and start adding your servers!
For debugging you can start sourcemon manually:
sudo su www-data -s /bin/bash
sourcemon