E-resources (overview)

https://paperpile.com/g/academic-research-databases/

Free e-journals
https://sttgkiiskijne.blogspot.nl/search/label/Informasi%20Perpustakaan

Free e-books on religion and spirituality

https://www.free-ebooks.net/religion-spirituality

Z Library, The World’s Largest E-book Library
Over 10 million books and 85 million articles

https://z-lib.org/

PDF Drive
78,422,966 eBooks (by 29-03-2022)
https://www.pdfdrive.com
How to use PDF Drive and alternatives for PDF Drive: https://editorialge.com/pdf-drive/

Index Theologicus. International Bibliography of Theology and Religious Studies (with access to free  books and articles)
https://ixtheo.de/

The Index Theologicus (IxTheo) (University of Tübingen, Germany)
Search function books and periodicals on theology
http://www.ixtheo.de/cgi-bin/ixtheo/maskeeng.pl?db=ixtheo

The Jewish National and University Library – Digitized Book Repository
http://aleph500.huji.ac.il/nnl/dig/list_all.html

By subject: http://aleph500.huji.ac.il/nnl/dig/bk_sub.html

E-books from Universitas Senata Dharma, Yogyakarta:
http://www.library.usd.ac.id/katalog/ibra.php#a

E-resources Royal Library of the Netherlands (Koninklijke Bibliotheek):
Books from 1700-1870 (i.a about the Netherlands Indies) (full text search):
http://boeken1.kb.nl/nl/results/index/query/indie/coll/boeken1/maxperpage/10/sortfield/datedesc

Dutch Archives
Digital resources for history from Dutch archives
https://www.historici.nl/

Indonesian authors and subjects

https://sinta.kemdikbud.go.id/

Internet Archive Scholar
https://scholar.archive.org

SciHub with access to millions of scientific publications:
Sci-Hub is a library website that provides free access to millions of research papers and books, without regard to copyright, by bypassing publishers’ paywalls in various ways. It was founded by Alexandra Elbakyan in 2011 in Kazakhstan in response to the high cost of research papers behind paywalls. In March 2022 it contained   933,189,871 papers and PDFs, freely accessible for anyone to read and download.  How to use it:
1. Go to Sci-Hub
2. Type in the article’s DOI in the search field
3. The article will be downloaded for free 

https://sci.hubg.org/

https://sci-hub.st/

https://sci-hub.se/

https://sci-hub.ru/   

or use the special Tor-only Sci-Hub link:
https://scihub22266oqcxt.onion

Paper Panda
PaperPanda is a Chrome extension that uses some clever logic and the Panda’s detective skills to find you the research paper PDFs you need. Essentially, when you activate PaperPanda it finds the DOI of the paper from the current page, and then goes and searches for it. It starts by querying various Open Access repositories like OpenAccessButton, OaDoi, SemanticScholar, Core, ArXiV, and the Internet Archive.
https://paperpanda.app/

Science Open:
ScienceOpen is a discovery platform with interactive features for scholars to enhance their research in the open, make an impact, and receive credit for it. We provide context building services for publishers, to bring researchers closer to the content than ever before. Our advanced search and discovery functions, combined with post-publication peer review, recommendation, social sharing, and collection-building features make ScienceOpen the only research platform you’ll ever need.  https://www.scienceopen.com/

CORE
CORE’s mission is to aggregate all open access research worldwide and deliver unrestricted access for all. Search 207,255,818 research papers around the world.
https://core.ac.uk/

Access to websites that offer free access to scientific publications. Please use a VPN or Tor to access these sites to protect your privacy. https://sharphunt.com/sci-hub-alternatives/

The Wayback Machine. Access to 544 billion web pages saved over time:
http://web.archive.org/

World Scholarship Forum: The best alternatives to the Wayback Machine (2022)
https://worldscholarshipforum.com/wealth/wayback-machine-alternative/

Academia.edu
Network of 176 million academics and researchers who share their knowledge and papers for free
https://www.academia.edu/

Project Gutenberg – many free e-books
http://www.gutenberg.org/catalog/

Wikibooks – English
http://en.wikibooks.org/wiki/Main_Page

Wikibooks – Bahasa Indonesia
http://id.wikibooks.org/wiki/Halaman_Utama

Wikibooks – Bahasa Malayu
http://ms.wikibooks.org/wiki/Laman_Utama

Google Books
http://books.google.com/

Many Books
http://www.manybooks.net/categories/

Sigil e-book editor. 
Sigil is a multi-platform WYSIWYG ebook editor.
It is designed to edit books in ePub format.
http://code.google.com/p/sigil/

BookBoon – free textbooks
http://bookboon.com/uk/textbooks