Math.NET is an opensource initiative to build and maintain toolkits covering fundamental mathematics, targetting advanced but also every day needs of .Net developers.
Math.NET Numerics aims to provide methods and algorithms for numerical computations in science, engineering and every day use. Covered topics include special functions, linear algebra, probability models, random numbers, interpolation, integral transforms and more.
Math.NET Neodym aims to provide a toolkit for digital signal processing, offering an infrastructure for digital filter design, applying those filters to data streams using data converters, as well as digital signal generators.
Fundamental computer algebra operating directly on native LINQ Expressions.
Math.NET Yttrium is an experimental graph/network computer algebra architecture, implementing ideas and concepts of formal hardware engineering and digital information processing, looking at abstract math and algebra from a different, new angle.