What 3rd party stuff do you allow?

[Expostfacto]

Now the general opinion is that 3rd party stuff is overpowered, underpowered, syphilitic, and should generally be avoided.

I've held this opinion as well until I realized I hadn't actually looked at any of the maligned materials.

So what do you guys allow or even often use that comes from 3rd party sources?

[GermanyDM]

Nothing so far. Not because I'm mean, but because we are trying to get our money's worth out of the many 1st party tomes. Serious, I've put a lot of money into that stuff and I'll be damned if we aren't going to milk it before we start looking even further.
Having said that, I'd definitely be willing to check out 3PP adventure modules. Call me fickle!

[Ascalaphus]

Making Craft Work; it's a pretty small thing, but it fixes the mundane Crafting rules. Actually I'm fine-tuning an adaptation of this, but it's elegant simple genius.

Rogue Glory is something I'm going to implement soonish, because I think it'll do a decent job putting rogue power level back with the other classes. But I actually bought it because it features a nice spread about the better Stealth rules that Paizo developed but didn't print because it would screw up CRB page count (and references to CRB from other books). Those new Stealth rules look a lot better.

[Rathendar]

I'm tentatively open to any 3PP products provided i can read through and process them before making the decision to allow them at my table. I tend to go with a "ok, let's see how it works in play, but if it reaches a point where i feel it has become broken i'll ask you to change/rewrite." Haven't had it become an unresolvable issue at a table yet, even when i have had to use the latter.

Super Genius Games has a lot that I or my players have looked into or dabbled with in actual play, if i had to single one out.

[judas 147]

I allow:
Spell Compendium
Magic Item Compendium
Skilltricks for all classes(at skill point cost adapted with -3 for prerrequisites)
Some Feats from Complete series (Two-Weapon Rend, Oversized Two-Weapon Fighting)

[Anguish]

I allow Dreamscarred Press' psionics material no questions asked.

I allow WotC's 3.5 material with the understanding that I reserve the right to deny anything at any time.

Otherwise I've not been asked, but a number of other PF 3rd-party publishers I trust enough that I would only lightly look things over.

[Elosandi]

Psionics, because it's a somewhat more balanced option that allows some interesting effects as a dedicated 'caster' without having to allow a full blown full caster from the core.

and the old Tome of Battle because it gives martial characters options beyond just hitting things with their weapon.

The fact that both those sources proved to be the best balanced out of all the 3.5 material also has an impact on my decision making in that regard.