The psionics are mostly included, in the Community Pack.
The classes and the powers are, along with a lot of the archetypes (maybe all now?).
The magic items aren't for the most part.
I have a player who sometimes wants to buy a whatever, but as often as not his desired thing is 3pp that isn't Paizo or from the 3pp publishers that out group uses; his search is usually on the d20pfsrd site.
The latest psionics (and has been out several years) is Ultimate Psionics, which is most of two paperback/softcover books combined into one hard cover.
They do have some small (Patreon funded, I believe) additions that aren't necessarily included in the Community Pack.
If you have spare time, they could be, a lot of it would be data entry (copy paste) from a sourcebook, but I'm not sure the specifics.
Tobyfox2002 has a massive thread, with a lot of stuff for previously popular settings.
I know Darksun is one of them, but it's not in the title of his stuff.
Not sure on Eberron.
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