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.
Selenium Builder (http://seleniumbuilder.github.io/se-builder/)
A test development environment for Selenium 1 and 2
PHP support for the Libravatar.org service.
Shea Dawsons SilverStripe modules (https://github.com/sheadawson/silverstripe-newsly)
Collection of SilverStripe modules by Shea Dawson
Kernel 3.0.XX for Samsung I9100
SilverStripe is a CMS and application framework based on PHP5 / MySQL that powers your medium-sized website. - Friendly flexible back-end out of the box - Complete design/template freedom - Productive object oriented coding framework (PHP5 only) - Open Source! :) - Works with the Web 2.0 rather than fighting it (supports APIs rather than having a module for everything) - Good at web standards and search-engine ranking
Silverstripe advancedreports (https://github.com/nyeholt/silverstripe-advancedreports)
A reporting module that provides an extra level of configuration and functionality over the base silverstripe structures. Generates static output content in HTML, CSV and PDF formats
SilverStripe composer security checker (https://github.com/spekulatius/silverstripe-composer-security-checke)
Provides a SilverStripe task which checks if any composer dependency has known vulnerabilities.
Silverstripe composer update checker (https://github.com/spekulatius/silverstripe-composer-update-checke)
Checks if a composer package has an update available.
Dashboard module for SilverStripe 3