.: Free Software :.
Hermetic Systems publishes commercial Windows software for word and phrase counting and other tasks, plus free software in the areas of prime numbers, web and graphics utilities and more (click on a title below to go to the product page).
Go to our Software Shop for descriptions of our other software products.

The Prime Number Spiral (a.k.a. the Ulam Spiral) is constructed as follows: Consider a rectangular grid. We start with the central point and arrange the positive integers in a spiral fashion (anticlockwise). The prime numbers are then marked. There is a tendency for the prime numbers to occur on diagonal lines, however far out into the spiral one goes. 

Windows software to convert radians to and from degrees, minutes and seconds, and to perform addition and subtraction of angles. 

This program is an interactive TABLE generator which handles COLSPAN and ROWSPAN, thus enabling creation of complex tables with cells larger than 1x1. Cell specifications can include cell content, font name, font size, color, alignment, etc. A cell specification can be copied to other cells, or all cells in a row or column, thus allowing rapid development of tables. 

A program to find prime numbers and pairs of primes, to decompose numbers into their prime constituents, to find all factors of any positive integer up to 2,147,483,645, and to plot ErdosKac and Palmen Color histograms. 

Software to convert from GIF, JPG, PNG and BMP graphics files to JPG, PNG and BMP files. Allows single or multiple (batch) file conversion. Can convert to JPGs over a range of quality/compression values for optimization. Converted files can be displayed in your browser. 

Windows software for exploring five cellular automata: qstate Life (a generalization of Conway's Game of Life), the BelousovZhabotinsky Reaction, Togetherness, Viral Replication and DiffusionLimited Aggregation. 

A Windows program for finding decimal and hexadecimal values for visually selected colors and inserting them directly into program code. 
These programs run under all versions of Windows from Windows 98 to Windows 10. The installation program for the fullyfunctional software may be downloaded by following the link from the product page (no activation key is required). Since they are free, no tech support is provided.
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