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
Free charting C# library for MONO (gtk-sharp 2.x). MPlot will support 2D line charts, xy scatter plots, bubble charts, radar charts,pie charts , bar charts , time series charts, candlestick plots, Gantt charts.