Most software I have written is in MUMPS due to my involvement in VISTA and RPMS. In the same arena, I have written software in C#, Javascript/HTML, Delphi and Java. Prior to getting involved in medical software, I wrote some stuff in ASP.net. I have some minor contributions in Python and C.
These are some of the big open source projects that I worked on.
Part 1 | Part 2 | Part 3 | Part 4
The summary of all this work can be found here.
A sizable collection of VISTA and RPMS set-up articles can be found on my page on Vistapedia.
Articles
Presentations
Installing VistA
Educational Resouces on VistA