This site is for free stuff that helps you learn science and engineering. I needed something to organize my engineering studies, and have been awed by the quality and depth of open educational material on the web, much of it in the footsteps of the MIT OpenCourseWare
project. Stemhub.org is a little tool in that spirit.
When you're logged in, the way to add links is to drag this button to your toolbar:
Whenever you find something useful to your coursework or other learning projects, click the button to save and share on stemhub.org