This is the first reference and handbook since the satellite era began, which describes and derives systematically the orbit theory with analytical solutions of the equations of satellite motion, with respect to all of the extraterrestrial and geopotential disturbances of the second order.

Beta-version of the german digital library.

XPP (XPPAUT is another name; I will use the two interchangeably) is a tool for solving * differential equations, * difference equations, * delay equations, * functional equations, * boundary value problems, and *stochastic equations.

On-line version of the NIST Digital Library of Mathematical Functions, which is an updated version of the legendary Handbook of Mathematical Functions by Milton Abramowitz and Irene Stegun.

Interesting lisp book in progress.

Web site offers a CAPTCHA test to distinguish between humans and robots. The results are used to correct texts from old books which were scanned.

Looks like an interesting book. The online version has lots of annoying advertisements, automatic(?) links (e.g. Octave points to the Wikipedia article about the frequency ratio, whereas the text refers to the free Matlab-like language) and "tool tips". A hardcopy version is announced for March.

A book trying to teach computers from first principles, i.e. gates, using a hardware description language (a simulator is provided), software tools (assembler, compiler) and a small operating system.

Book about programming languages, published under a creative commons license.

From comp.os.plan9.