Top 20 NuGet factorization Packages

CSparse.NET provides numerical methods for sparse LU, Cholesky and QR decomposition of real and complex linear systems.
Powerful MatrixDotNet library for matrix calculation With all answers see documentation or ask on gitter or github issues
Methods and extensions for prime number detection and discovery. Part of the "Open" set of libraries.
With all answers see documentation or ask on gitter or github issues
Puresharp is a Framework that provides the essential APIs to productively build high quality (.NET 4.5.2+ & .NET Core 2.1+) applications through reliability, scalability and performance without no compromise.
IPuresharp urbanize libraries with strategic private code to lay transparent foundations for Puresharp API .NET
MatrixDotNet.Extensions.Core is a extension for MatrixDotNet .NET Core 3.1 which increase perfomance with happen unsafe programming and SIMD.