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Portable Tools for Physics and Astronomy:
Sky Quality Meter-LE

Ethernet Sky Quality Meter with Lens

Available now

Ethernet connected model with narrow Field-of-View

Sky Quality Meter-L

Sky Quality Meter with Lens

Narrow Field-of-View Sky Quality Meter with lens.
Sky Quality Meter

Sky Quality Meter

An affordable meter for measuring sky brightness for astronomers!

Nu-B

Nu-B

Narrow-band low-cost spectral light source.

Posters:
Electromagnetic spectrum

Electromagnetic Radiation Spectrum poster

This poster includes all known ranges of EMR including brain waves, communication frequencies, microwave background radiation, etc, as well as the audio spectrum, all organized by octaves.
Pi Poster

Pi poster

Upon closer examination, 350,390 digits of pi are visible. The most commonly recognized digits are visible from a distance.
Primes Poster

Primes poster

Upon closer examination, 54,222 primes are visible. The first 122 prime numbers are visible from a distance.
e Poster

e poster

Upon closer examination, 350,390 digits of e are visible. The most commonly recognized digits are visible from a distance.

Open Source:
Gonvert: the Unit conversion utility

gonvert

A very complete Unit Conversion Utility that runs on Linux and Windows. All units in a category get converted while you type. FREE / Open  Source.
Magnetometer

Magnetometer

This project measures slight changes in the Earth's magnetic field. These changes are useful for determining the occurence of Aurora/Astralis Borealis.
4 to 20mA utility

4to20mA Utility

This calculator helps determine various values related to 4 to 20mA conversions used in PLCs and instrumentation. FREE / Open  Source.
Physio Timer

physiotimer

Physio Therapy Timer
A timer for physiotherapy exercises. Open  Source.
TVNOW for Linux

tvnow

TVNow is a low cost "pay" system that delivers satellite dish channel information. This Free/Open source Linux program is a front-end interface to TVNow.
Saydate speaks the date

saydate

A Linux shell program that says the date. Simply type saydate and the program speaks the actual date (e.g. "the date is thursday november the twenty-fifth nineteen-ninety-nine").
saydate home. FREE / Open  Source.
Grocget

grocget

Grocery Getter Helper
This program will enable you to shop for groceries much faster.
I originally needed something like this many years ago but did not have the tools to program it for Windows, so I found something close to it written by someone else and used that until I found the tools to write my program for Linux. FREE / Open  Source.
 

Papers:
Circadian Appetite Control

Circadian Appetite Control

Did you know that the visible light spectrum can help ?

Find out how.