SageMath Inc. is an open source software company that produced https://cocalc.com. CoCalc (formerly called SageMathCloud) is a web-based cloud computing (SaaS) and course management platform for computational mathematics. Part of the Sage project, it supports editing of Sage worksheets, LaTeX documents and Jupyter notebooks. CoCalc runs an Ubuntu Linux environment that can be interacted with through a terminal, additionally giving access to most of the capabilities of Linux. CoCalc provides infrastructure and services that are useful for running courses based on Jupyter Notebooks. It is used for teaching by Universities around the world.