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Adds a number of days 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 Weak and day-in-year (yyyy-ddd).

This software scans a file, or text on the clipboard, and counts the number of occurrences of different words. The text can be in a language other than English. The words which are found and displayed can be ordered alphabetically or by frequency.

The search module of Hermetic File Search is for searching HTML or text files (or similar) on CD or hard disk by keywords (searches can be on any word, all words or exact phrase). It uses data files produced by a previously-created index module.

The index module of Hermetic File Search is for indexing HTML or text files in a hierarchy of files on CD, hard disk, etc. (not a website), so as to provide the data needed by the search module.

This software scans a text file, multiple files or text on the clipboard, and counts the number of occurrences of different words. The text can be non-English. The words which are found and displayed can be ordered alphabetically or by frequency.

For encryption and decryption of email messages, optionally with attached files up to 100 KB in all. Keys are maintained in an encrypted list of keys for easy access and repeated use. Program is bilingual: English/German.

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.

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.

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.