CoCalc - Collaborative Calculation in the Cloud: CoCalc is a sophisticated online environment for: Mathematical calculation: SageMath, GAP, SymPy, Maxima, …; Statistics and Data Science: R Project, Pandas, Statsmodels, Scikit-Learn, TensorFlow, NLTK, …; Document authoring: LaTeX, Markdown/HTML, ... General purpose computing: Python, Octave, Julia, Scala, … Zero Setup: getting started does not require any software setup.