Jewish
Naaleh
Torah study videos
YIVO Institute for Jewish Research
largest collection of Holocaust primary documentation in North America
Tablet
opinion & commentary
Jewish texts
Ets Haim Bibliotheek
Oldest still functioning Jewish library in the world founded in 1639, Amsterdam
Polonsky Foundation Catalogue
British Library Hebrew Manuscripts
Schneerson Collection
18th C Lubavitch Hasidim books at Russian State Library - search, view record, select electronic record
Sefaria
A living library of Jewish texts, Github projects
Encyclopedia Judaica
downloadable
Mamre Institute
Tanakh, Maimonides' commentary, data, apps, Baladi Yemenite Jews
Project 929
4 year reading cycle
DAF notes
7.5 year cycle for Babylonian Talmud reading (Daf Yomi) with notes