libcom.org's clearly written short introductions to various political philosophies related to libertarian communism with which we are sympathetic.
Introductions to political theories - libcom.org
Libertarian communism and capitalism - an introduction
libcom.org's old basic introduction to our understanding of the world as it is, what we think can be done to make it better, and how a libertarian communist society could function. We no longer think it is particularly good but reproduce it for reference. We have largely replaced it with our introductory guides.