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In addition to software you can also find on this Hermetic Systems website many articles concerning calendars, encryption, computational science, etc.  The main sections are as follows:

Word and Phrase Counting   Cryptography and Security
Calendar Studies   Calendar Software
Website Tools   Mathematical Software
Computational Science   Miscellaneous
C/C++ Programming    

Below are listed partial contents of the main sections (click on the section headings to see the entire contents of each section).  The title index gives an alphabetical list of selected pages on this site. There are also a FAQ, a What's New page and a list of most popular articles. There are also descriptions of several items of our software in German and in Spanish. And you can search this site.

pointer    Word and Phrase Counting

pointer   C/C++ Programming

pointer   Cryptography and Security

  • Email Encryption End-to-End
    A program 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

  • Cryptosystem ME6
    An encryption program which uses a symmetric key encryption algorithm (with 500-bit keys) to encrypt information in files for secure storage or transmission.

  • Stego PNG
    Another steganographic application (but easier to use) for hiding a message file of any type within a PNG or a BMP image file.

  • Data Destroyer
    A program to overwrite the contents of single or multiple files before deletion so that the data cannot be recovered.

  • Recycle Bin Wiper
    A program for wiping deleted files in the Windows Recycle Bin by overwriting them repeatedly so that the data cannot be recovered.

pointer    Website Tools

pointer   Calendar Studies

pointer   Calendar Software

  • Easy Date Converter
    A conversion program which gives you the day of the week for a date, the Julian day number and more, and allows date arithmetic: adding a number of days to a date, etc., with or without inclusion of weekend days. In English and German.

  • Equinoxes, Solstices and Cross-Quarter Days
    For calculating accurate dates and times of equinoxes, solstices and the Celtic cross-quarter days for any year in the range 1 CE through 3000 CE (for both hemispheres).

  • Lunar Calendars and Eclipse Finder
    Software for conversion among dates in the Common Era and Julian Calendars and dates in several lunar calendars. The program also finds the dates, times and durations of solar and lunar eclipses.

  • Chinese Calendrics
    Software for converting between Chinese and Western dates and for obtaining other information such as the dates of Chinese New Year's Day for any year.

  • Julian-Gregorian-Dee Date Calculator
    Converts between Julian, Gregorian, Dee and Dee-Cecil calendar dates in various formats, and adds and subtracts a number of days, weeks, months and years to or from a given date.

  • Mayan Calendrics
    Converts among Maya and European dates in various calendar systems. In English and German.

  • Printable Calendar
    A modest utility to help you keep track of things to do.

  • Printable Hermetic Lunar Week Calendar
    Same but different.

  • Identical Calendar Years
    How long do you have to wait before you can re-use that old wall calendar that you like so much?

pointer   Computational Science

pointer   Mathematical Software

  • Factorizer
    A factoring and prime number program (also plots Erdös-Kac and Palmen Color histograms).

  • Prime Number Spiral
    Software for exploring the Prime Number Spiral (a.k.a. the Ulam Spiral). In English and German.

pointer   Miscellaneous