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.
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 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 maintenance (https://github.com/FriendsOfSilverStripe/silverstripe-maintenance)
Allows you to watch your SilverStripe application for security releases and updates.
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 update checker (https://github.com/spekulatius/silverstripe-composer-update-checke)
Checks if a composer package has an update available.
Database management tools from Skype: WAL shipping, queueing, replication. The tools are named walmgr, PgQ and Londiste, respectively
Snowy is a web application for synchronizing, viewing, sharing, and editing your Tomboy notes online. It is designed to power an upcoming Tomboy Online free web service where any Tomboy user can make an account. It can also be used on your own personal server. Snowy is AGPL-licensed and written in Python using the Django framework.