Over the years, I have contributed to many open source projects. The following list gives a (not neccessarily complete) overview of my contributions:
- 2021: Admidio: Several improvements
- 2018-…: R packages: Contributions to openxlsx, Author of MortalityTables and LifeInsuranceContracts
- 2016-2017: MySensors: Several improvements and device support in NodeManager
- 2016-2017: ESPEasy: Plugin for RFLink devices and my own VentaConnected board
- 2012-2018: VirtueMart: Core patches to Virtuemart and plugins for the webshop software
- 2010: CUPS foo2lava printer driver: command filter to display supply status
- 2010: pae2xml (Plaine & Easie to MusicXML converter): Full support for the whole Plaine & Easie specification
- 2007-2014: LilyPond (GNU music typesetting software): Several new features
- 2007-2014: musicxml2ly (MusicXML to LilyPond converter): Many enhancements
- 2005: SANE scanner driver for Konica Minolta magicolor 1690mf
- 2004/05: curator (image gallery generator): various enhancements
- 2000-2008: KDE: KOrganizer maintainer, libkcal , KPilot, holiday editor, etc.
