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.
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Easystroke - Easystroke is a gesture-recognition application for X11.
PiPifier - PiPifier is a macOS 10.
StrokesPlus.net - Mouse Gestures and More for Windows