GitSheet - A dead simple Git cheat sheet.
Statsbot - Connect your database, let Statsbot generate data relationships from your database automatically, and get your first insights in a matter of minutes.
AI Cheatsheet - A tool to help you ace AI basics
Google Analytics by SumoMe - The easiest way to see your Google Analytics
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
Datadeck - Spreadsheets visualized In two clicks