Some Very Introductory Material
What Is Marxism?
http://www.allaboutphilosophy.org/what-is-marxism-faq.htm
The Internet Encyclopedia of Philosophy Entry on Socialism
http://www.iep.utm.edu/socialis/
Introduction to Marxism: Course material from Dino Franco Felluga, PhD, Purdue.
https://www.cla.purdue.edu/english/theory/marxism/
What is Democratic Socialism? Q & A (Democratic Socialists of America)
http://www.dsausa.org/what_is_democratic_socialism
The Internet Encyclopedia of Philosophy Entry on Socialism
http://www.iep.utm.edu/socialis/
Welcome to Socialism from r/Socialism
https://www.reddit.com/r/socialism/wiki/welcome_to_socialism
Socialism 101
https://www.socialism101.com/
Socialism 101: The Basics
https://www.socialism101.com/basic
Socialism 101: Dictionary
https://www.socialism101.com/dictionary
The Learn Socialism Collection
https://learnsocialism.dropmark.com/554165
General Readings List
Why Socialism (Albert Einstein)
https://monthlyreview.org/2009/05/01/why-socialism
170 Years of Anarchism
http://anarchism.pageabode.com/anarcho/170-years-of-anarchism
150 Years of Libertarian
https://theanarchistlibrary.org/library/the-anarchist-faq-editorial-collective-150-years-of-libertarian
Longer Basic/Introductory Readings
The ABCs of Socialism (PDF from Jacobin)
https://s3.jacobinmag.com/issues/jacobin-abcs.pdf
Capitalism Must Die (PDF)
https://collapseofindustrialcivilization.files.wordpress.com/2014/02/cmdebook111213.pdf
Marxist Reading List
The Communist Manifesto
https://www.marxists.org/archive/marx/works/1848/communist-manifesto/
The Principles of Communism
https://www.marxists.org/archive/marx/works/1847/11/prin-com.htm
Wage Labour and Capital
https://www.marxists.org/archive/marx/works/1847/wage-labour/
Value, Price, and Profit
https://www.marxists.org/archive/marx/works/1865/value-price-profit/index.htm
The German Ideology
https://www.marxists.org/archive/marx/works/1845/german-ideology/
Why Russia Isn't Socialist
http://www.sinistra.net/lib/pro/whyrusnsoc.html
Anarchism Reading List
An Appeal to the Young
http://dwardmac.pitzer.edu/Anarchist_Archives/kropotkin/appealtoyoung.html
The Conquest of Bread
http://dwardmac.pitzer.edu/Anarchist_Archives/kropotkin/conquest/toc.html
What Is Property?
https://theanarchistlibrary.org/library/pierre-joseph-proudhon-what-is-property-an-inquiry-into-the-principle-of-right-and-of-governmen
ABC of Anarchism
https://libcom.org/files/AlexanderBerkman-ABCofAnarchism.pdf
What Is Communist Anarchism
http://theanarchistlibrary.org/library/alexander-berkman-what-is-communist-anarchism
The Anarchist FAQ
http://www.infoshop.org/AnarchistFAQSectionA
A Mutualist FAQ
http://www.mutualist.org/id23.html
Left Wing Readings Collections and Archives
The Marxist Internet Archive
http://www.marxistsfr.org/index.htm
The Marxist Internet Archive Text Index
https://www.marxists.org/txtindex.htm
The Anarchist Library
theanarchistlibrary.org/
The Communist Left
(Archive of the Review of the International Communist Party)
http://www.sinistra.net/lib/upt/comlef/comleft.html
Some Prominent Left Wing Websites and Archives
Marxist.net
http://www.marxist.net/
Trotsky.net
http://www.trotsky.net/
Libcom
https://libcom.org/
Infoshop
http://www.infoshop.org/
Anarkismo
http://www.anarkismo.net/
Anarchist Writers
http://anarchism.pageabode.com/
CrimethInc
https://crimethinc.com/
Institute for Anarchist Studies
https://anarchiststudies.org/
Mutualist.org
http://www.mutualist.org/
Center for a Stateless Society
https://c4ss.org/
Reddits
r/Marxism
https://www.reddit.com/r/Marxism/
r/Socialism
https://www.reddit.com/r/socialism
r/Socialism 101
https://www.reddit.com/r/Socialism_101/
r/Socialism Suggested Readings
https://www.reddit.com/r/socialism/wiki/suggested_readings
r/Anarchism
https://www.reddit.com/r/Anarchism/
r/Anarchy101
https://www.reddit.com/r/Anarchy101
r/Anarchy101 Canon
https://www.reddit.com/r/Anarchy101/wiki/canon
US Left Wing Political Parties and Organizations
Socialist Party USA
https://www.socialistpartyusa.net/
Party for Socialism and Liberation
https://www.pslweb.org/
Democratic Socialists of America
https://www.dsausa.org/
Industrial Workers of the World
https://www.iww.org/
Catholic Worker
https://www.catholicworker.org/
Left and Left Leaning News and Commentarty
Roar
https://roarmag.org/
Shadowproof
https://shadowproof.com/
Counter Punch
https://www.counterpunch.org/
Current Affairs
https://www.currentaffairs.org/
Indy Media
https://www.indymedia.org/or/index.shtml
Mother Jones
https://www.motherjones.com/
The Monthly Review
https://monthlyreview.org/
The Root
https://www.theroot.com/
Splinter
https://splinternews.com/
Dissent Magazine
https://www.dissentmagazine.org/
Jacobin
https://jacobinmag.com/
Monthly Review
https://monthlyreview.org/