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Shameless promotion: SageMathCloud (https://cloud.sagemath.com https://cloud.sagemath.com) does many of those things, is also open source under the same license
by williamstein 10y ago
Shameless promotion: SageMathCloud (https://cloud.sagemath.com https://cloud.sagemath.com) does many of those things, is also open source under the same license as PubPub, and built on similar technologies to PubPub (React, CodeMirror).