FreePm is an open source project to create a provider designed patient centered electronic medical record and practice management application. This is probably one of the most developed projects out there, seems already quite usable in its Demo. More significantly, they offer services to help actually run their software in a real office, but all the code is opensource and they seem committed to this philosophy. (source: http://www.linuxselfhelp.com/HOWTO/Medicine-HOWTO/record.html)