PH Builds a Puzzle - A realtime, collaborative jigsaw puzzle.
Crossword Compiler - The New Puzzle wizard lets you chose the type of puzzle to make and guides you through choosing a size, which words to use, and automatically generating the puzzle.
Dood : The Puzzle Planet - A strategy puzzle game for the smart ones
Crossword Weaver - Create custom, free-form or themed, newspaper style crossword puzzles
63 - 63 is a race against the world.
Beekeeper Labs CrossFire - Cross-platform tool for creating professional quality crossword puzzles