Pixen is a sprite art program with many unique features. It is designed expressly for pixel art. To this end, it features extensive palette management and palette-swapping tools, a highly configurable grid overlay, a full complement of drawing tools, 'crosshairs' for ensuring proportion and straight lines, isometric line locking, extremely configurable backgrounds (for testing a sprite against various colors or images), and a full implementation of layers.
Pipe helps you write, test, and debug shell scripts quickly while using your favorite text editor. You can filter text through your scripts and see the script source, input, and output simultaneously. Pipe also provides a system-wide service so you can feed text from any application through your scripts.