Welcome to Fourmilab Switzerland

Last update: 16 October 2017

This site is developed and maintained by John Walker, founder of Autodesk, Inc. and co-author of AutoCAD. A variety of documents, images, software for various machines, and interactive Web resources are available here; click on entries in the frame to the left to display a table of contents for that topic. Items which span more than one category are listed in all.

A comprehensive (and large) list of all items on the site is available as a frame- and graphics-free Site Map.

Except for a few clearly-marked exceptions, all the material on this site is in the public domain and may be used in any manner without permission, restriction, attribution, or compensation. Back links to this site are welcome.

Fourmilog: Site Update and Web Log
John Walker's Reading List
Fourmilab Photo Album
Follow Fourmilab on Twitter

New and frequently-visited pages

New: Marinchip Systems: Documents and Images
New: ISBNiser: Validate, interconvert ISBN-10 and ISBN-13, generate Amazon links
New: Apparent Diurnal Variation in Background Radiation
Updated: Unum: Version 2.2 supports Unicode 10, HTML5
New: Little Wars, H. G. Wells's 1913 classic on miniatures wargaming
New: Decide: A just machine to make big decisions
Updated: Cellular Automata Laboratory: Browser-based simulator
New: Terranova Planet Maker: Make planets in your browser
New: The Go-Getter, Web edition of the 1921 classic
Updated: The Analytical Engine, Twentieth Anniversary Update
 
JavaScrypt: Browser-Based Cryptography
The Digital Imprimatur and The Internet Slum
HotBits: Random numbers from radioactive decay
The Autodesk File
Earth and Moon Viewer
The Hacker's Diet
Paleo Postings The paleo diet and lifestyle
Solar System Live
Your Sky
Total Solar Eclipse 2010, 2008, 2001, and 1999
U.S. Tax Code Online
The Analytical Engine