- "Just the Maths" by A. J. Hobson (A very easy to understand presentation on different topics on Mathematics)
- Xfig and Latex
- LAPRINT (LaTeX Print) (Control and Automation at Universitat Kassel)
- The Not So Short Introduction to LaTeX (by Tobias Oetiker et al.)
- Basic linear algebra (determinants, PD matrices, etc.)
- Math World
- Optimization Technology Center
- The OR Library (a collection of test data sets for a variety of Operations Research (OR) problems)