A collection of free (GPL) tools to process GPS-related data (RINEX files, etc.) written in C++. Includes bindings to Octave. The goal of the GPSTk project is to provide a open source library and suite of applications to the satellite navigation commun
Home page of the mathematician Herbert Wilf, which offers some of his books for download. I have already read the very interesting "Mathematics for the Physical Sciences".
Periodic table of elements, as large PNG image. There is copyright on the design, although I cannot see what is so special about it. Let's be thankful that Mendeleev was more generous.
This is a map of the wheel-ruts of modern English. Etymologies are not definitions; they're explanations of what our words meant and how they sounded 600 or 2,000 years ago.
The Online Encyclopaedia of Mathematics is the most up-to-date and comprehensive English-language graduate-level reference work in the field of mathematics today. This online edition comprises more than 8,000 entries and illuminates nearly 50,000 notions
On-line dictionary with multiple languages: german, english, french, italian, spanish, portuguese, dutch and swedish. Also has unit conversion calculators etc.
It seems that the intersection of people interested in Plan 9 and those interested in Lisp is not empty. Several small Lisp implementations, books (some of them in german) about them and lightweight compilation. Nice essay about the advantages of plain