Theory is a JavaScript library to conduct theoretical math operations.
It includes functions for abstract algebra, set theory and more.
Its homepage is at https://fonte.me/theorymath/theory_js.html
Author: Jeremy Fonte
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Digital Brain
Digital Brain provides various tools for online brainstorming, including tables, drawings and notes – on desktop browsers only.
At this time there is no save feature, so this is for short-term brainstorming.
It’s completely free and available at https://fonte.me/digitalbrain/