itch.io

Generally, I wouldn't. Maybe one of these days I'll make an OSR thing since I use those pretty regularly too, but I wouldn't convert the CGtG to work with them. NOW that said, if you just wanted to use it, I would point out that  capacity damage is pretty analogous to regular damage in the original guide to growth with some balancing for the fact that in some cases exhausting capacity can instantly end a fight.

So, I would say start  by looking at the values, costs, etc of various abilities or enchanted items. Then convert those to damage values smore appropriate for their level in OSR settings.

It is not, unfortunately. I am familiar with Savage Worlds though and it's one of my favorite systems. I can't promise anything because I have too many irons in the fire but maybe one day we'll drop some SW content that will be compatible with Savage PF.

Probably never. I'm not a user of Fantasy Grounds. 

That said, before any VTT expansions I would probably want to have a full release of the book anyway, which is looking iffy between my focus shifting to a different book, and the general public response between the 2014 and 2024 rules. It'll definitely happen I think. It's just going to take a while.

Yes and no. There are no foundry VTT parts in this, but Foundry is also a very flexible system. So you could use these rules, but you'd have to manually make things as they come up.