AzaMath - Anizoptera CMF mathematic component.
Provides functionality to work with large numbers with arbitrary precision (using BCMath) and universal mumeral systems conversions (supported bases from 2 to 62 inclusive, and custom systems; pure PHP, but can use GMP and core functions for speed optimization).
A conversion program written in as a Windows Forms Application in Visual Basic to convert roman numerals to regular numbers and back. It can handle up to 3,999,999. It requires the .NET Framework 3.5 and is licensed under the the CC GNU GPL.