I contribute to a number of open source software projects on a regular basis. An overview can be found on OpenHub.

FreeBSD

FreeBSD is an open source Unix-like operating system that can be found (as a whole or in parts) in Apple Mac OS X and iOS, Sony Playstation 4, Juniper routers and NetApp storage filers, to name a few. I have been a developer with the project since 2003, and also contribute to related projects like TrustedBSD.

Commits

to the source code repository

to the documentation repository

to the ports repository

Conference Contributions

NYCBSDCon 2010, New York City, USA – Practical Security Event Auditing with FreeBSD [PDF]

meetBSD 2007, Warsaw, Poland – Protecting your Privacy with FreeBSD and Tor [PDF] [video]

FrOSCon 2006, Sankt Augustin, Germany – FreeBSD im Überblick [PDF]

Magazine Articles

BSD Magazine 04/2009 – FreeBSD Security Event Auditing