Welcome to Fourmilab

Last update: 9 November 2023

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
SCANALYZER (What's this?)
John Walker's Reading List
Fourmilab Photo Album
Follow Fourmilab on Twitter

New and frequently-visited pages

New: Nuclear Fission Fuel is Inexhaustible
New: FourmiFood: Salmon Pasta Tonnato; Eggplant Parma-Sham
New: The Stratified Bible
New: ClassWar
New: Blockchain Tools
New: UNUM—Updated for Unicode 14.0
New: Tools for Online Privacy
New: Mind Grenade
New: Units Calculator
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
Cellular Automata Laboratory
Paleo Postings The paleo diet and lifestyle
Solar System Live
Your Sky
Total Solar Eclipse 2010, 2008, 2001, and 1999
Bipolar: North Pole (2008), South Pole (2013)
The Analytical Engine