On-Screen Ruler - lightweight, free, semi-transparent ruler
Superpeer Channels - Beautiful livestreams with your subscribers
Meazure - What are the dimensions of that image? How big is this window?
The Mentoring Club - Free mentoring from the best in their field
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Tribe of Mentors - Short life advice from the best in the world, by Tim Ferriss