All NMath libraries are available here in trial versions. They are fully-functional but are limited to 30 days on a single computer and contain no source code.

NMath Core

NMath Matrix (requires NMath Core)

NMath Stats (requires NMath Core)

NMath Analysis (requires NMath Core)

NMath is not an application. It is a suite of component libraries intended for use by .NET programmers. Although not strictly required, use of Microsoft Visual Studio .NET or other .NET IDE is strongly encouraged.