On-Screen Ruler - lightweight, free, semi-transparent ruler
Photomosh - Turn anything into a vaporwave
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
MVGEN - Make your own music videos with audio, gifs, and special effects
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.
HearSeeParty - Combine Gifs with with music using tags