math lib for .NET. n-dim arrays, complex numbers, linear algebra, FFT, sorting, cells- and logical arrays as well as 3D plotting classes help developing algorithms on every platform supporting .NET. Sources from SVN, binaries: http://ilnumerics.net
MathLib.NET is to be a open source library for the Microsoft .NET Framework and seeks to provide statistical functions, approximations, along routines that will extend the existing mathematical functions available.