any legal entanglements here with the OGL?
As has being pointed out, you need to publish under the OGL, rather than the GPL. The OGL is a king of GPL, so its not really much of a practicle concern.
I would really like to do this, but if the legal ramifications make it impossible, so be it.
There is one very big gotcha. The part of the OGL that says "all open gaming content must be clearly indicated", is interpreted by Wizards (in the strongest possible way) to mean that any code you have that implements the D20 rules *must* be openly viewable by anyone. In other words, you cannot compile d20 rules or data into source code for any language such as C, C++, or any other language.
It makes your life a *lot* harder, but it can be done.
You can find a full implementation of such as system at http://www.roleplayingmaster.com .
Its a D20 framework that lets you easily add new material (classes, feats, skills etc) to it.
In fact, I was able to implement a substiture rules supplement for the revised 3.5 in a matter of days - including specials like the monk attack options.
All the stuff in there that gives you mapping, adventure building, a rules and campaign encyclopaedia, a battlemap, and other stuff ins't actually encoding D20 rules into it, so its okay.
Good Luck! Luke
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