http://www.wizards.com/default.asp?x=d20/article/srd35
Just the basics, but nearly all the basics, of D&D. Free, legal, including monsters.
Anything that has an Int score of 3 or higher(Sentient) that has a level adjustment(Number that is added to your character level if you play that race) can be played. And if you make a good case for it, you can play something with an Int score of 2 or less. See the 'If you yell loud enough' rule.
Perhaps I should expound a bit...If you want a halfling barbarian paladin wizard, go right ahead. If you want a half-dragon, half-celestial vampire monk, go right ahead. If you want a human fighter, go right ahead. If you want a pixie barbarian, go right ahead. But some of those will have to wait until you have a character with a high enough character level to trade in.
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If I only could remember half the things I'd forgot, that would be a lot of stuff, I think - I don't know; I forgot!
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Some of my webcomics. I've got 400+ webcomics at Last count, some dead.
Sig updated to remove non-working links.