From Drupal and Moodle, right through to a Git versioning system and Perl modules on CPAN, we contribute back to over 175 community open source projects. This list is in order of the number of projects contributed to.
Python Social Auth - Application - Django
Convert QR code image to OpenSCAD file
raven-sh is wrapper executing a command and sending its stdout/stderr to the Sentry server. Useful for cron jobs
Talk to the Raygun.io API
recur rnn miscellany (https://github.com/douglasbagnall/recur)
A collection of Gstreamer plugins based on recurrent neural networks
Global requirements for OpenStack projects
Create RabbitMQ based RPC consumers with decorators
Content Management System for Django
Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. It can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks or network discovery (it can replace hping, 85% of nmap, arpspoof, arp-sk, arping, tcpdump, tethereal, p0f, etc.). It also performs very well at a lot of other specific tasks that most other tools can't handle, like sending invalid frames, injecting your own 802.11 frames, combining technics (VLAN hopping+ARP cache poisoning, VOIP decoding on WEP encrypted channel, ...), etc.