Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.

NWEA Assessments - NWEA Assessments creates a personalized assessment experience by adapting to each student's learning level.

Meazure - What are the dimensions of that image? How big is this window?

Canvas by Instructure - The Canvas LMS is the world's fastest growing learning management system. Check out favorite features and schedule a live demo!

Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.

ExamView Assessment Suite - ExamView lets you can create assignments, launch classroom assessment questions and collect real-time responses to evaluate student performance.