On-Screen Ruler - lightweight, free, semi-transparent ruler
Hive - Seamless project management and collaboration for your team.
Meazure - What are the dimensions of that image? How big is this window?
Sup! Standup Bot - The complete stand-up and follow-up bot
JR Screen Ruler - JR Screen Ruler, also known as JRuler - Free virtual ruler for your computer screen.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.