Orion's Arm is a long term, collaborative, web-mediated world-building project. For a GM or player, it can be a neat resource for ideas, 'toys,' cultures and societies. It also has some things that don't fit with Sufficiently Advanced :
- Archailects rule most of the universe
- Technology that really doesn't make sense, and can't be used, unless you're an archai, specifically Godtech.
- Way too much emphasis on things that aren't human and not comprehensible by humans (i.e.: us) via the topsophic scale.
- No FTL save wormholes which have to be moved to their destination via STL means.
And that's just the start. For a lot more check out the Orion's Arm Welcome Page with its links to timeline and FAQs.
Anyway, I'll link to pages in OA over the next few days and weeks to hopefully save you time, energy and effort.
PS: I'd have sworn I posted this last night, but I guess I was sleepier than I thought.