1)   Algebrus 3.0
Scientific calculations and data analysis software. 2D and 3D graphic plots of functions and data. Calculations with vectors, matrices, tensors, complex numbers, fractions, quaternions, polynomials. Data fitting, statistics, optimization, spectrums.

 2)   Super 2d/3d Graph Library 10.4
Award-winning .NET library for 2d and 3d chart drawing. Can be used either as a Winform control or in ASP.NET web pages. Standard Edition only 79$. Royalty-free!