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PlanetMath was a mathematics portal, the main function of a Mathematics - Encyclopedia was that on similar principles to Wikipedia was set up and for their contents and the GFDL used. As of 2013, the PlanetMath encyclopedia contained over 9,200 articles with about 16,200 terms.

PlanetMath was designed a bit more restrictively than Wikipedia. For example, basically only registered users could create or change content, and articles had “owners” who managed their changes. In addition, the site had more extensive quality assurance structures than the early Wikipedia. In addition to a general discussion thread for each article, there was also a separate thread for technical corrections and additions or attachments ( errata and addenda ). There was a detailed rating and review process for articles and authors, as well as statistical information about the number of hits and links to an article, which should be used to assess the article's reliability and importance. PlanetMath articles were created entirely in LaTeX and categorized using the Mathematics Subject Classification (MSC) of the American Mathematical Society (AMS) and the Zentralblatt MATH .

The idea for founding PlanetMath came from the lawsuit over MathWorld in 2000, which resulted in this popular online encyclopedia no longer being available online for 12 months and the user community looking for alternatives. PlanetMath was co-developed by Nathan Egge and Aaron Krowne in 2000–2001, and much of the initial articles were written by members of the Undernet's math channel (#math) . For a long time, PlanetMath was operated on a server at the Digital Library Research Lab at Virginia Tech in Blacksburg, Virginia. From 2009 to February 2011, servers in an Amazon cloud were used and from February 2011 PlanetMath ran on servers of the University of Waterloo .

PlanetMath was initially operated with the specially developed software system Noösphere . On March 13, 2013, operations were switched to the Planetary software system developed in Drupal .

In 2018, the portal and the encyclopedia were shut down. The previous content was made available as LaTeX files on GitHub .

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