1313 Diagon Alley: Tour to Diagon Alley and "Find Harry Potter" -game.
Avada Kedavra: Harry Potter RPG exploring the conflict of good and evil at the time when the power of Lord Voldemort was reaching its height.
Butterbeer RPG Community: Takes place through the journals created by different members to role-play and interact as Harry Potter characters.
CNN money: Harry Potter Currency Converter: Converts dollars into galleons, sickles, knuts, and vice versa.
Funtrivia: Harry Potter Quizzes: Contains various quizzes to play and create.
Harry Potter Quizzes Online: Book trivia quizzes and word searches.
HarryPotterFans.com: A collection of games and puzzles, a links directory and a free email address offer.
Ministry of Magic: RPG including chat, newsboards, and jobs section.
Prior Incantato - A Maurader's Era HP RPG: RPG with settings in Hogsmeade, Hogwarts and the Muggle World.
Skyride 3D: A 3D Quidditch game. You play as Seeker, and try to catch the Snitch. A download page and screenshots.
The Online Quidditch League: RPG text based quidditch game. Requires Java.
Veritaserum: Confessions of a Hogwarts Student: A journal based roleplay ages 15 and up based after book 5.
Virtual Harry: Tests and games that determine the character one could assume in the Harry Potter world.