Here are a few of the resources (websites, books etc.) that helped me in my studies or that I've created for my students; those in Romanian are not included:

### Computer Science and CP

- Learn you a haskell
- Jeremy Kun
- Codeforces
- Atcoder
- Competitive Programmer's Handbook
- CLRS
- Algorithm Complexity Analysis
- Thinking functionally with haskell
- Algorithms: a Functional Programming Approach
- Concrete Mathematics (my kickstarter in CS related mathematics)
- A list of techical problems
- A list of beautiful problems

### Mathematics

- Problem Solving Strategies
- Dummit-Foote Abstract Algebra
- Basic Linear Algebra
- Mendelson Topology
- Topology without Tears
- Introduction to Diophantine Equations
- Generatingfunctionology
- Introduction to Lambda Calculus
- A survey of Mathematical Logic
- On Formally Undecidable Propositions of Principia Mathematica and Related Systems

### Physics

- Bradsen-Jochain Quantum Mechanics
- Variational Principles of Mechanics
- Theoretical hydrodynamics
- I'm sorry, but I didn't study so much Physics from English books

### Miscellaneous

- Tractatus Logico-Philosophicus
- Some Remarks on Logical Form
- Genki - Elementary Japanese
- Secrets of Mental Math