tabletop gaming

D&D comes in many flavors, and you can play old school for free with a retro clone such as Labyrinth Lord. It is a social game and many adventures are designed for 5 or 6 players. It can be played over the Internet using free tools such as Skype, Google Docs, and dicelog.com. There are many resources available, and you can adapt resources from other games. For beginners or smaller groups, Dungeon Plungin' might be a better option.