I develop software as a spare time/hobby endeavor, and offer them all for free. Most of my applications fall into one of two categories:
(1) simple utility applications intended to provide improved usability and simplicity over currently available tools; and
(2) programs and games intended to stimulate creativity and/or critical thinking in a fun way.
Jester: The Song Parody Editor is my first freeware offering. Writing song parodies is a great way to develop the skill of switching rapidly between analytical and creative modes of thought.
Ultimate Tic-Tac-Toe is my latest freeware offering. It is a challenging new spin on the old Tic-Tac-Toe game. You can play against the player or play 2-player games.