Games

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.
http://uk.geocities.com/finiteincantatem/

Butterbeer RPG Community
Takes place through the journals created by different members to role-play and interact as Harry Potter characters.
http://www.caleida.com/userinfo.bml?user=butterbeer_rpg

Lumos
Play-by-post role playing game. Events take place before the epilogue of Deathly Hallows. Playable canon and non-canon plot lines.
http://lumosrpg.com

Prior Incantato: Rising Tide
RPG with settings in Hogsmeade, Hogwarts and the Muggle World.
http://hppriorincantato.yuku.com/

Virtual Harry
Tests and games that determine the character one could assume in the Harry Potter world.
http://feenyoda.tripod.com/virtualharry/home.html

Witherwings
Year 1999 Harry Potter Role-Play. Settings include Hogwarts, Diagon Alley and Castle Lestrange. Playable students, adults or creatures. Ally with Death Eaters or the Order.
http://witherwings.info