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I'm pleased to annouce a new open source software project that we're developing at Topos Institute: CatColab. The tool is under heavy development but you can play with a demo at the link above.
In one sentence, the aim is to make modeling in category-theoretic domain-specific languages accessible to people who do not necessarily have any training in category theory or mathematics generally. For more, @Kevin Carlson has written a nice blog post explaining the project and where we hope to go with it: Introducing CatColab
Great work! I can't wait to play with it when I find some time