Easily convert numbers to and from binary, hexadecimal and octal
Simplified Number Conversion!
Command-line utility that will help you convert numbers between different numeral systems
AIR-based Arabic/Roman Numeral converter
BConv is a small Python script that converts between numbers in base 2..36.
Hextrapolate – A flexible number conversion utility for programmers and people who work with numbers in a digital setting.
EnToutesLettres – Multilanguage number to full text conversion service