Commercial Dev Tools?

Commercial Dev Tools?

I know that our games have to be able to build and run on free open software, but are we allowed to use non-free stuff for our development as long as they run on free as in freedom software for the judges?  For instance, via my university, I got access to:


- Visual Studio 2010 Ultimate

- Photoshop


And I am used to them both for dev work.  Visual studio doesn't effect stuff as much as photoshop.  My game requires buildings, so I'm assembling them with the provided tilesets in Photoshop, and I'm saving the psd files, and later exporting them to png to use in my game.


Thanks for the input!