Soviet era Mathematics (and other sciences) books here : https://mirtitles.org/ These are concise but quite dense and pretty good. Students are well advised to go through these in addition to their prescribed textbooks.

Easier to access here: https://archive.org/details/mir-titles

Mir is amazing for math books and sadly underappreciated in the US.

Yep, Teachers and other knowledgeable folks should point students to them. Many of these are being republished by Indian publishers on Amazon India.

Another good (and affordable) source of Mathematics/Science books are the ones from Dover Publications.

I wonder if someone could crawl this and provide an archive? I'd love to get the whole set and I'm sure there are others who would also.

You could probably build a mirror with `wget -r` without writing a crawler.

nohup wget -r -np https://downloads.tuxfamily.org/openmathdep/

seems to be working pretty well for me

Brilliant! This is exactly what I was hoping for: Thank you!

Exactly!

Appreciate small efforts like these

A simple search and bibiography might add a lot of value here

One of us who is enthusiastic enough might implement a "ask this book" chatbot on top of this repo, maybe? Hopefully that doesnt violate any copyrights either

Related, website I came across the other day with free resources on many math topics: https://realnotcomplex.com/

Includes books, lecture notes and videos.

There isn't that much stuff there. If you have any specific interest you can find it in about 30 seconds.

They have several Bourbaki volumes which I haven't been able to get for free and legal before which I enjoyed reading.

Shameless plug. See also https://github.com/rossant/awesome-math