- Binary Coded Decimal (BCD)
This online calculator converts decimal number to binary code in BCD notation and vice versa

- Binary, inverse and complement codes
Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

- Caesar cipher
Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

- Conversion between two positional numeral systems
This calculator converts number from one numeral system to another, given both system's bases

- Conversion from decimal numeral system
This calculator converts given decimal value to other positional numeral system

The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

- Conversion of fractional numbers between numeral systems
This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.

- Count the number of words
The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.

- Email extractor
This online calculator parses emails from block of text using regular expression

- GET request string parser
This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

- Hill cipher
This calculator uses Hill cipher to encrypt/decrypt a block of text

- Huffman coding
This online calculator generates Huffman encoding for given frequency of occurrence of symbols.

This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36

- LL1 grammar analysis. Yet another top-down parser generator.
The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

- Regular expression tester
This online calculator allows user to experiment with regular expressions.

- Shannon Entropy
This online calculator computes Shannon entropy for a given event probability table and for a given message

- Symbol frequencies table
This online calculator builds symbol frequency table for a given message

- Vigenère cipher
Calculator encrypts entered text by using Vigenère cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.