AEG had some good ones, like Mercenaries, War, Evil, Dragons, Toolbox, Rokugan, etc. as well as their own games, 7th Sea and Spycraft.
I started to include both this and Hot Pursuit: On Foot. I just have not used them despite owning them. Good stuffHot Pursuit: The Definitive D20 Guide to Chases.
I saw the preview and thought and it looked impressive. I gave up trying to find a copy at a reasonable price.If you can find it, I also like Human Head's Redhurst: Academy of Magic.
A good one that deserves mention.AEG had some good ones, like Mercenaries
I will second this.I'd strongly recommend Green Ronin's 3rd Era PDF Mega-Bundle (affiliate link). It has some 3.5 stuff too, but you're also getting incredible 3.0 books like Plot & Poison: A Guidebook to Drow, Freeport: City of Adventure, Testament: Role-Playing in the Biblical Era, and quite a few more. They even included the old web enhancements from their website!
These are all great. For @Bestbake , Legions of Hell: Book of Fiends #1 and Hordes of the Abyss: Book of Fiends #2 were released individually for 3.0. They were updated and compiled for 3.5 in Book of Fiends which also includes, essenentially, a third volume not released under 3.0.The original 3.0 Death in Freeport and trilogy is great. As are the 3.0 Legions of Hell and Hordes of the Abyss.
I'll note that Legions of Hell and Armies of the Abyss actually aren't in this bundle. The 3.5 Book of Fiends is, which as @Greg K noted also had what was basically a third book built in, but you won't find the 3.0 versions of the first two in there.The original 3.0 Death in Freeport and trilogy is great. As are the 3.0 Legions of Hell and Hordes of the Abyss.
I'll second this as well. Fantasy D&D Africa with neat ancient orc and serpent people type history. I combined it with Golarion's Garund for my homebrew mashup world's southern continent.I'd like to recommend Nyambe: African Adventures, and not just because I'm one of the contributing authors.
If you want Samurai clan focused D&D Rokugan is fantastic, a great 3.0 setting that uses a lot of its own classes. If you want a fantasy japan 3.0 monster book Creatures of Rokugan is great. Unfortunately they are not part of the sale.AEG had some good ones, like Mercenaries, War, Evil, Dragons, Toolbox, Rokugan, etc. as well as their own games, 7th Sea and Spycraft.