https://cloud.sagemath.com https://cloud.sagemath.com is similar, but aimed at higher education (especially mathematics). I've spent most of my time implementi

https://cloud.sagemath.com https://cloud.sagemath.com is similar, but aimed at higher education (especially mathematics). I've spent most of my time implementing this during the last year, and many people are using it in conjunction with classes. Saving the time of setting up a uniform development environment, and making collaboration easy, seems to be pretty important for students in classes.