Rychu 

Easy to use library for validating Polish NIP numbers: string nip = "8674068337"; bool isValid = Rychusoft.Validators.NipValidator.IsValid(nip);

Easy to use library for computing math formulas, mean and proportion. Is a basis of Rychusoft.NumericalLibraries. var calc = new Calculator("8^2+5-cos(2*PI)"); var result = calc.Compute(); // result = 68"

Easy to use library for validating Polish PESEL numbers: string pesel = "44051401458"; bool isValid = Rychusoft.Validators.PeselValidator.IsValid(pesel);

Easy to use library for computing derivative and function value at given point. var derivative = new Derivative("x^2 + 5 - cos(2 * PI * x)"); var result = derivative.ComputeDerivative(1); // result = 2

Set of Bessel's functions for Rychusoft.NumericalLibraries suite

Common library for Rychusoft.NumericalLibraries suite

Easy to use library for computing differential equations. var math = new Rychusoft.NumericalLibraries.Differential.Differential(""3*x^2-5""); var result = math.ComputeDifferential(4, 2, 0); // result = 46

Easy to use library for validating Polish REGON numbers: string regon = "575064641"; bool isValid = Rychusoft.Validators.RegonValidator.IsValid(regon);

Library for computing function interpolation and approximation

Chart component for Rychusoft.NumericalLibraries suite

Library for computing fourier transform

Library for computing linear equations

Easy to use library for computing integrals. var math = new Integral("3*x^2-5", 5, 10); var result = math.ComputeIntegral(); // result = 850

Easy to use library for computing zero (root) of a function. var math = new FunctionRoot.Hybrid("(x+1)^2-9", 0, 1.5); var result = math.ComputeHybrid(); // result = 2

Easy to use library for measuring execution times of code sections: var execution = ExecutionTimeCounter.Start("SLEEP EXECUTION"); Thread.Sleep(5); ExecutionTimeCounter.Stop(execution); var result = ExecutionTimeCounter.ResultsToString(); Console.WriteLine(result);

Takes care of creating and deleting PID file in ASP.Net Core applications.