- Math Keyboard layout – description and download
- Mathematical symbols in ISO 80000-2 – a test page
- Math in HTML (and CSS): how to present mathematical symbols and formulas on the Web
- A calculator with elementary functions, as HTML5 application
- Characters in SI notations
- Go metric! (see also the links section in my material on the SI system in Finnish)
- Natural numbers as exponents of operations - a formalization of Wittgenstein's definition
- Reverse division and continued fractions (by David Cary, edited by me).

Recommended link: Eric Weisstein's World of Science - a very large collection of material on physics, chemistry, etc. - and his enchanting World of Mathematics.

Note to Finnish readers - Suomalaisille lukijoille:
Tämän aihepiirin suomenkielisten sivujeni hakemisto on
Matematiikka, fysiikka ja kemia.