Sebastián Moncho from Spain has made a Java-based editor for Bygfoot team definition files, making it a lot easier for all non-programmers to create definitions of their favourite teams.
Here's a screenshot:
You can get a jar version and the source version of the editor here.
To execute the jar package, you need the Java Runtime Environment and the java executable in your PATH. Type java -jar bygfoot-team-creator-2006-07-06.jar to start the editor.
Have a look at Sebastián's site for a quick tutorial on how to use the editor. You might also want to check out the Bygfoot team definition howto.
Many thanks to Sebastián for his work and let's hope he'll do some more editors (countries, leagues, strategies etc.) in the future!