Gesturefy - Customizable mouse gesture addon, which supports over 40 different actions. Features:
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Strokeit - StrokeIt is an advanced mouse gesture recognition engine and command processor.
PiPer - A DIY Minecraft computer to build gadgets
crxMouse Chrome Gestures - Boost browsing productivity with mouse navigation shortcuts - simple Mouse Gestures, Super Drag, Wheel Gestures, Rocker Gestures.
Pennywise - Cross-platform application to open any website or media in a floating window