I feel like the minutia of 3.5 keeps a lot of people from joining. There is definitely a bunch of resources for new players and a thriving community to keep it alive, but it's kinda bloated and the main draw to the game tends to be that kind of bloat.
Furthermore, there's some cool games on the OGL license that take drastic turns away from it. Legend is a little curiosity I sometimes indulge in looking through, but it's so far removed from 3e that it's hard to call it 3SR.
Lastly, like some others have mentioned, there is already the SRD that you can use whenever and you have a couple decades of Giant in the Playground and dndwiki to comb through if you really want. Just learn how to pick and choose for (You)r setting.
>>96917616
You're Three Five Archive? Holy based. I listen to a lot of what you do during work or walks home. Keep it up man.
Beyond that, I don't think WotC is too protective of their weird 3.5 subsystems that would be the main draw to copy. Stuff like Incarnum could definitely enjoy a rework.