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Epic Pen - A windows tool for drawing over your desktop and applications
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
gInk - An on-screen on-screen annotation software for Windows.
PiPer - A DIY Minecraft computer to build gadgets
Gromit-MPX - Create annotations by directly drawing on your screen.
Pennywise - Cross-platform application to open any website or media in a floating window