Some possible/not possible sources that could be used to manually bootstrap content:
* <LibreTexts>. Good project. "Teacher-only-content" unfortunately as usual. But besides that fundamental flaw, they do exactly what we want to do in a sense.
* <OpenStax>: <CC BY>. This could be a great entry point, as they already have some university integration going on, and might be interested in this project.
* https://physics.stackexchange.com/questions/6157/list-of-freely-available-physics-books "List of freely available physics books" explicitly asks for:
  \Q[a list of physics books with open-source licenses, like Creative Commons, GPL]
  but the thread <closing questions as off-topic>[was locked], and basically none of the sources in the answers have free licenses, nor do they note it. It just seems that the <physicists> don't know what a <free license> is.
* <MIT OpenCourseWare>: <CC BY-NC-SA>, so not really usable
* https://github.com/certik/theoretical-physics[]: <MIT License>. https://opensource.stackexchange.com/questions/324/are-permissive-licenses-mit-bsd-zlib-compatible-with-cc-by[Workable] but wonky.
* https://subwiki.org/[]: <wiki> with some upper graduate <math> subjects presumably by this <Indian> dude: https://www.linkedin.com/in/vipul-naik-0ab1898/[]. Description on his homepage: https://vipulnaik.com/subwiki/[]. He's also got other interesting but not so relevant projects:
  * pro freer immigration laws: https://vipulnaik.com/openborders/
  * https://vipulnaik.com/cognito-mentoring/ free mentoring project for interested students
  He's also into <Stack Overflow>, <Quora> and <Wikipedia> editing. That's a cool dude. He's into in <LessWrong> it seems.
* massive <mathematics> books
  * <Infinite Napkin>.<CC BY-SA> <mathematics> infinite book: https://github.com/vEnhance/napkin/issues/77[]. Very similar type of content to what we want in this project!
  * <Stacks Project>

Existing lecture notes by students:
* https://github.com/mb2g17/NotesNetworkArchive <Google Docs>-based: https://docs.google.com/document/d/1OIcQ8dJ_FAhdkirU94M29-ZbNZ4oQs1LbWF3Nz-mq_U/edit\#heading=h.vehxib58w1iw[]. An actual student uploading tons of lecture notes in one coherent system. <CC BY-NC-SA> unfortunately.
* https://academia.stackexchange.com/questions/148261/do-you-keep-your-study-notes-publicly-available mentions:
  * Cambridge Mathematics Lecture Notes by Dexter Chua (2014-2018)
    * http://dec41.user.srcf.net/notes/
    * https://github.com/dalcde/cam-notes
  Related: https://academia.stackexchange.com/questions/40381/how-common-is-it-that-professors-have-their-students-write-textbooks

Lecture note upload website:
* https://nexusnotes.com likely illegal reuploads of PDFs from teachers
* https://www.studocu.com/en-gb Paywall. PDF uploads. Unclear if simple teacher reuploads or actual novel notes.
* https://www.studydrive.net/
* Chinese GitHub repos. Some of these are very advanced in terms of content quantity and organizational quality! The Chinese are miles ahead in this area:
  * https://github.com/PKUanonym/REKCARC-TSC-UHT Guidance for courses in Department of Computer Science and Technology, Tsinghua University. Chinese. Appears to try and store all past exams.
  * https://github.com/lib-pku/libpku
  * https://github.com/openwhu/OpenWHU[]: Wuhan University
  * https://github.com/USTC-Resource/USTC-Course[]: USTC
  * https://github.com/Zeal-L/UNSW[]: <UNSW> from <Australia>, but by a Chinese dude
  * https://github.com/apachecn/mit-18.06-linalg-notes[]: translation of <MIT> course to Chinese
  * https://github.com/chenyang1999/MyComputerCollegeCourses[]: TODO which univeresity
  * https://github.com/elder-frog/OpenCourseCatalog[]: nothing to do with this project, but since I'm making a list, this dude is copying <YouTube> videos to <Bilibili>. And he's edgy anti-CCP on Twitter, what a legend.
  * https://github.com/TheBloodthirster/BUAA_Course_Sharing[]: https://en.wikipedia.org/wiki/Beihang_University

Exams uploads:
* https://questions.tripos.org/part-ib/all/ <University of Cambridge> Mathematics past examinations

<Personal knowledge base> recommendation threads:
* https://news.ycombinator.com/item?id=23942342
* https://www.reddit.com/r/selfhosted/comments/l37w0j/personal_knowledge_base/
* https://www.reddit.com/r/selfhosted/comments/esso3u/personal_knowledgebase/
* https://www.youtube.com/watch?v=XRpHIa-2XCE
  * Joplin, TODO

Personal knowledge bases:
* Forester
  * https://www.jonmsterling.com/tfmt-0001.xml


Discussion on "Existing data sources" by Ciro Santilli 32