Meazure - What are the dimensions of that image? How big is this window?
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
ScreenRuler - ScreenRuler lets you measure objects on your Ubuntu desktop using six different metrics.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab