Leftypedia is an online collaborative encyclopedia that inspired the creation of ProleWiki. The primary difference between ProleWiki and Leftypedia is that Leftypedia seeks to be a "big tent" "catch-all leftism" encyclopedia, whereas ProleWiki aims to follow the line of scientific socialism, that of Marxism-Leninism.
Without an emphasis on scientific socialism, one can fall into the utopian trap of anti-authoritarianism, and being tricked into supporting imperialist propaganda against "Actually Existing Socialist" states.
As of 2022, their website is presently unavailable.