Prestiege Class Sources?

[Riveneye]

I'm a bit new to the whole D&D thing, and have been lurking here for a while now, and noticed that many people refer to come prestiege classes (and maybe even normal classes, or feats etc) that aren't in the core D&D books, as if they were the norm, and everyone should know about them, and I was wondering where I could find info on all these other prestiege classes (and feats and whatever else) that are frequently mentioned.

 

[Eternalknight]

Try DM Buddy. It has an index of prestige classes and where to find them.