Just as a quick note, I’ve finally gotten around to changing the license under which I offer the Vectorstorm engine code. Previously, it was GPLv3. Now it’s released under the terms of the zlib license, which is far more permissive. Been meaning to do this for years, and only got around to it while I was ill and not feeling up to actually writing real code.
So for you programmers out there, feel free to swipe the code, modify it, embed it in commercial applications, or whatever. Credit would be appreciated, but is not by any means required.
The Vectorstorm testbed games, and various “Game in a Week” games are all still covered under the GPLv3; the only thing to have switched to zlib is the engine code itself, which can be found on Github.