.: Free Software :.

Hermetic Systems publishes commercial Windows software for word counting and phrase counting and other tasks (see here), plus free software in the areas of prime numbers, web and graphics utilities, and more.

All these programs are hand-crafted for functionality and ease-of-use, and have been extensively tested. Click on a title to go to the product page.

Radian-Degree Calculator

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

Easy Graphics File Converter

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.

Hermetic Color Picker

A Windows program for finding decimal and hexadecimal values for visually selected colors and inserting them directly into program code.

Prime Number Spiral

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.

HTML Table Creator Tool

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.

Duplicate Text Finder

Duplicate Text Finder is for comparing two sets of text files to find files in one set which are either exact duplicates of files in the other set or nearly exact duplicates (if an initial segment of text is passed over).


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 Erdos-Kac and Palmen Color histograms.

Five Cellular Automata

Windows software for exploring five cellular automata: q-state Life (a generalization of Conway's Game of Life), the Belousov-Zhabotinsky Reaction, Togetherness, Viral Replication and Diffusion-Limited Aggregation.

These programs run under all versions of Windows from Windows XP to Windows 10. The installation program for the fully-functional 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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