3.5 is (as you'd expect) a revised edition of 3.0; Both are covered by the OGL 1.0 (which was created for the release of 3.0).
3.5 was an update released for balance reasons, as I understand it and didn't change core gameplay - it removed some of the more broken exploits, but you can use 3.0 material with 3.5 with relatively few, if any changes: most of the balance problem was player side.
I used to play basic D&D as a child, and then sort of ignored the whole genre until around 2005 when I picked it back up again, using 3.5, so I'm not an expert on it by any means.
IIRC, 3.1 was available on both 3.5" and 5.25". And even that took a few years for 5.25 to vanish. Anything outside those two formats was in noman's land for what seemed like forever.
Thanks for the information. I am mostly migrating the game to get a first-hand idea of some of the changes I'm most likely to run into while developing the next one.
I, too, am happy to stay with 3.5.x. It works pretty well for my purposes, though hopefully 4.x will be a viable option for me soon.
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