Mumu - Ditch your macOS emoji picker
On-Screen Ruler - lightweight, free, semi-transparent ruler
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Fitbit Ace - Fitness fun for kids
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.