Software by Hermetic Systems

The Prime Number Spiral (a.k.a. the Ulam Spiral) is formed by marking the prime numbers in a spiral arrangement of the natural numbers. This is software is for exploring the Prime Number Spiral.

A program to search for eclipses (lunar, solar, total, annular and umbral), to calculate the phase of the Moon at any given date and time and to convert between dates in the Gregorian and Julian calendars and dates in five lunar calendars.

A web authoring tool which acts on an HTML document, counting the number of occurrences of words and how they are used, and produces an appropriate keywords meta tag. The Advanced Version can act on multiple documents in a folder and its subfolders.

A web authoring tool which scans an HTML or PHP file, counting the number of occurrences of words and how they are used, and produces an appropriate keywords meta tag for the document. Customizable operation and it works with non-English text.

This software scans one or more text or text-like files (e.g. HTML files) and counts the number of occurrences of different words or phrases (optionally with pattern matching). The words/phrases can be displayed alphabetically or by frequency.

This software scans a file, or text on the clipboard, and counts the occurrences of different words. What is a 'word' is user-definable. The words found and displayed can be ordered alphabetically or by frequency. Supports non-English text as well.

A steganography program which allows you to encrypt and hide a file of any size in BMP image files, with or without the use of a stego key, so that the presence of the hidden file is undetectable, even by software using statistical methods.

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

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.

This program is for sending and receiving encrypted email messages (optionally with attached file) and is designed to be both secure and easy to use. It uses a symmetric key method. It works with any email program. Bilingual, English/German

This program includes an interactive TABLE generator which handles COLSPAN and ROWSPAN, and provides an easy way to create HTML code from lists and tables in textfiles, and to convert data in textfiles to finished HTML documents.

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

Adds or subtracts a number of days or months to a date, calculates the number of days between two dates, and converts among dates in various solar calendars: Gregorian, Julian, ISO 8601 Week, Hermetic Leap Week and day-in-year (yyyy-ddd).

A program for secure file deletion which destroys (by overwriting) data in multiple files and multiple folders so that the data cannot be recovered. Single-file or batch-mode operation. Can delete 'old' files.

Windows software for encryption and decryption of single files or multiple files in a single operation for secure storage or secure transmission. It uses a 500-bit key for security, and has features designed to minimize the chances of user error.

A program to convert between dates in the Chinese, Vietnamese and Japanese lunar calendars and dates in the Gregorian and Julian calendars, and to find lunar new year's day and leap months for any year in the Asian calendars.