Beta function is defined as

There are some other formulas. For example, there is a well known formula which expresses the beta function through the gamma function:

This formula is used in the Beta subroutine which calculates the value of the beta function.

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C#

C# 1.0 source.
betaf.csharp.zip - Beta function

C++

C++ source.
betaf.cpp.zip - Beta function
ablas.zip - optimized basic linear algebra subroutines with SSE2 support (for C++ sources only)

Delphi

Delphi source.
Can be compiled under FPC (in Delphi compatibility mode).
betaf.delphi.zip - Beta function

Visual Basic 6

Visual Basic 6 source.
betaf.vb6.zip - Beta function

Zonnon ^beta

Zonnon source.
Zonnon is an experimental language developed at ETH Zurich.
See www.zonnon.ethz.ch for more information.
betaf.zonnon.zip - Beta function