Rebound is a reimplementation of the game called Diamonds which existed for the Macintosh in the early 90s. It is a cross between a puzzle and an action game. The game play requires the player to use the ball on the screen to hit bricks and destroy them. However, rather than hitting the ball with a paddle like breakout, the player controls the left and right movement of the ball with the arrow keys. The ball still bounces up and down on its own, but there is no bottom to fall off of.
YasSS (Yet another (simple|stupid) Sudoku Solver) is a Sudoku solver for the command line. It solves any Sudoku puzzle and generates Sudoku puzzles. It can calculate the number of solutions, print a difficulty rating, and generate a canonical form for a puzzle. It also provides a curses interface for playing Sudoku.