FitNesse[?] is essentially a fancy wrapper for FIT. FIT originally written in Java by WardCunningham[?], is the engine that actually runs your tests. There is an additional component called FitServer[?] that allows FitNesse[?] to interface with FIT. FitNesse[?] is not limited to running only Java tests. Given an implementation of FIT and the corresponding FitServer[?], FitNesse[?] can execute tests in any language. Below is a list of all languages with FIT/FitServer[?] implementations.

• Java - Included in the fitnesse.jar.
• .NET - Included in the standard FitNesse[?] distribution.
• C++ - C++ FIT and FitServer[?]
• Delphi - Delphi FIT and FitServer[?]
• Python - Python FIT and FitServer[?]
• Ruby - Ruby FIT and FitServer[?]
• Smalltalk - Visual Works Smalltalk FIT and FitServer[?]
• Perl - Perl FitServer[?]