Arr-Kelaan Software has seven GM-oriented programs available for free download, including HexMapper, which lets you create old-school hex maps of your campaign world.
The other tools are Dice Roller, Random City Generator, Town Designer, Spell Book Builder, Campaign Calendar Generator and Random Weather Generator (all with fantasy GMs in mind).
They’re all in beta, and will be released as shareware when they’re out of the testing period. They require VB 6.0 to run. (Via Jeff’s Gameblog.)