OpenTrivia

This site's trivia categories:

• Movie & TV
• Literature
• Geography
• History
• Sport & Fun
• Comics
• Computers
• Science
• Music
• Fine Arts
• Misc.

Puzzle related

• Games for the Brain: My other puzzle site featuring many different games to train memory and have fun.
• Crossword Construction Kit: Easy-to-use Windows shareware to create your own instant crosswords from a set of questions and answers.
• 20 Questions: Think of something, answer 20 questions, and let the bot guess what it was... fed by a growing database.
• Open Directory: Trivia: Collected links on the topic of browser-based trivia games.

Miscellaneous

• QML: The free Quest Markup Language for Choose-Your-Own-Adventure games.
• JavaScript Games: A collection of DHTML games. Look out for Pac Man and Frogger. There's info on every game, plus a search page.