PhotoFlare - Quick, simple but powerful Cross Platform image editor.
cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
PixBuilder - Free Photo Editing Software for PC
cheat.sh - The only cheat sheet you need Unified access to the best community driven documentation
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
explainshell - Match command-line arguments to their help.