I don't want to publicize any website in particular, but if you Google "best books algorithms", you'll probably get the ones everyone knows about:

- Introduction to Algorithms by Thomas H. Corman

- Algorithms by Robert Sedgewick & Kevin Wayne

- The Algorithm Design Manual by Steve S. Skiena

- Data Structures and Algorithms. Aho, Ullman & Hopcroft

- ...

Simiarly, just Google "best books software engineering".