Libraries
RuTracker - http://rutracker.org/forum/index.php
My RuTracker account - https://rutracker.org/forum/tracker.php?rid=45195282
YggTorrent - https://www3.yggtorrent.wtf/engine/search?name=&do=search
A place to look for French books.
Library Genesis - https://libgen.st/
Z-Library - https://singlelogin.re/
VK Files - https://vk.com/docs
Twirpx - https://www.twirpx.com/
Флибуста - http://flibusta.is/a
Internet Archive - https://archive.org/
Google Books - https://books.google.ru/advanced_book_search?hl=en
HathiTrust - https://www.hathitrust.org/
Wikisource - https://wikisource.org/wiki/Main_Page
Mobilism - https://forum.mobilism.org/viewforum.php?f=120
OceanofPDF - https://oceanofpdf.com/
Gutenberg - https://www.gutenberg.org/
NYPL - https://www.nypl.org/research/collections/articles-databases
If the Library Genesis, Z-Library, or Sci-Hub domain is blocked, look at Wikipedia for a new one.
CD collections:
Henry’s Bibliothek:
https://btdig.com/d96c3a3af2d88479ff591189e16ef1d826a7f286/henrys.bibliothek
https://btdig.com/9be384b7b8b4bf4e7d1ee4f18734766847363256/henrys.bibliothek
Libraries by topic
National:
Чтиво - https://chtyvo.org.ua/
Україніка - http://irbis-nbuv.gov.ua/cgi-bin/ua/elib.exe?C21COM=F&I21DBN=UKRLIB&P21DBN=UKRLIB
Інститут історії України - http://history.org.ua/uk
Ізборник - http://litopys.org.ua/mainf.htm
Deutsche Digitale Bibliothek - https://www.deutsche-digitale-bibliothek.de/
https://www.reddit.com/r/AskHistorians/comments/126r0i5/historical_german_newspaper_archive/
ÖNB Digital - https://onb.digital/
ANNO - AustriaN Newspapers Online - https://anno.onb.ac.at/
Gallica - https://gallica.bnf.fr/accueil/ru/content/accueil-ru?mode=desktop
Persée - https://www.persee.fr/
Internet Culturale - https://www.internetculturale.it/
Biblioteca Italiana - http://www.bibliotecaitaliana.it/catalogo?start=1&autori=Aesopus&undefined
National Library of Greece - https://digitalcollections.nlg.gr/nlg-repo/dl/en/search.html?clearSearch=true
Biblioteca Nacional de España - http://bdh.bne.es/bnesearch/Inicio.do
Biblioteca Nacional Digital - https://bndigital.bnportugal.gov.pt/
National Diet Library - https://dl.ndl.go.jp/
Nasjonalbiblioteket - https://www.nb.no/
Det Kgl. Bibliotek - http://www5.kb.dk/editions/any/2009/jul/editions/en
The National Library of Finland - https://digi.kansalliskirjasto.fi/etusivu?set_language=en
The National Library of Poland - https://bn.org.pl/en
Wielkopolska Digital Library - https://www.wbc.poznan.pl/dlibra
Česká Digitální knihovna - https://ceskadigitalniknihovna.cz/
Hungarian National Digital Archive - https://en.mandadb.hu/
Digital Library of Georgia - https://dlg.usg.edu/
Leitir - https://lbs.leitir.is/discovery/search?vid=354ILC_LBS:07000
Tímarit.is - https://timarit.is/
KBR - https://belgica.kbr.be/belgica/
KBR - Périodiques - https://www.belgicaperiodicals.be/
KBR - Belgicapress - https://www.belgicapress.be/
History
Digital Handbook for Research on Soviet History - https://dccollection.share.library.harvard.edu/openaccess
History of Finland - https://histdoc.net/history/history.html
Perseus Digital Library - http://www.perseus.tufts.edu/hopper/
Early English Books Online - https://www.nypl.org/research/collections/articles-databases/search?q=Early+English+Books+Online&page=1
Nineteenth Century Collections Online - https://go-gale-com.i.ezproxy.nypl.org/ps/exploreCollections?userGroupName=nypl&prodId=NCCO
U.S. Declassified Documents Online - https://go-gale-com.i.ezproxy.nypl.org/ps/start.do?p=USDD&u=nypl
Велики рат - https://velikirat.nb.rs/
Philosophy
Early Modern Philosophy - https://www.earlymoderntexts.com/texts
Psychology
Classics in the History of Psychology - http://psychclassics.yorku.ca/index.htm
Society
Electronic Enlightenment - http://www.e-enlightenment.com.i.ezproxy.nypl.org/browse/
Memory of the World Library - https://library.memoryoftheworld.org/####/books
Monoscop - https://monoskop.org/Monoskop
Thomas Mrett - https://archive.org/details/@ismail_badiou
Georgian Section of Comintern - https://web.archive.org/web/20180708051244/http://joseph-stalin.net/List%20of%20Books.html
Banned Thought - http://bannedthought.net/
From Marx to Mao - http://www.marx2mao.com/
Massline - https://massline.org/
Marxist Internet Archive eBook Collection - https://www.marxists.org/ebooks/
Foreign Languages Press - https://foreignlanguages.press/foundations/
Lady Izdihar - https://ladyizdihar.com/
Revolutionary Democracy - https://revolutionarydemocracy.org/
Marxists Internet Archive - https://marxists.architexturez.net/archive/index.htm
Marxist Philosophy and Dialectical Materialism - https://www.marxistphilosophy.org/
The Anarchist Library - https://theanarchistlibrary.org/special/index
ml-historie - https://www.akp.no/ml-historie/html/english.html
IRC:
mIRC - https://rutracker.org/forum/viewtopic.php?t=2901572
HexChat - https://hexchat.github.io/downloads.html
Join #ebooks on IRCHighway or #bookz on Undernet.
https://www.reddit.com/r/Piracy/comments/2oftbu/guide_the_idiot_proof_guide_to_downloading_ebooks/
Tor Browser:
RuTracker - http://torrentsru5dbmqszbdinnz7cjiubxsjngq52qij6ih3fmp3gn7hwqqd.onion/forum/index.php
Library Genesis - http://libgenfrialc7tguyjywa36vtrdcplwpxaw43h6o63dmmwhvavo5rqqd.onion/search.html
Flibusta - http://flibustaongezhld6dibs2dps6vm4nvqg2kp7vgowbu76tzopgnhazqd.onion/a