Yes, ALL versions of SiteDirector are open source.  We have created SiteDirector to be customized and expect changes to the code.

 

The code is fairly well commented and shouldn't be too difficult to find your way through.

 

You are welcome to modify the code, but keep in mind that if you are adjusting the code and there is a problem that you cannot solve.  We will have to charge our normal hourly rate to help rectify the problem if it is because of your change in code.  QuillDesign's typically quotes as a quote instead of per hour.