You mention Goodman Games. Necromancer and Paizo, of course, are the two other popular adventure publishers. Necromancer's Judges' Guild material is top notch.
Kalamar's adventures can be hit or miss, but the amount of material in each one is higher than any other publisher in the 3E era. Lots of appendices, maps, and show-the-players pictures in each one.
The Hackmaster stuff, though it would need a little conversion, is really overlooked for the quality of adventure material within.
If you can mod adventure without too much difficulty, I suggest going back and looking at what the previous 30 years of RPGs offers. There are more excellent modules pre-2000 than post. As someone who owns about 300 published d20 adventures (more including Dungeon mag), take my word for it.