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 ## Encyclopedia
 
+* [Androma](https://androma.org) - Open mathematics wiki with theorem database, proofs, prerequisite tracking, spaced repetition study tools, and collaborative LaTeX editing.
 * [Encyclopedia of Mathematics](https://www.encyclopediaofmath.org)
 * [Planetmath](http://planetmath.org/)
 * [ProofWiki](https://proofwiki.org/wiki/Main_Page)