The NSketch library provides implementations of most common sketch-based algorithms (histograms, quantile, frequent items, bloom filter ...). The library is written in C# for .Net.
Ruby scripts grow 3D fractals and render them with PovRay, OpenInventor and YASRT. Includes (rough) ports of Lauren Lapre's LPARSER to GNU C++. Includes a RubyTk "sketch" output for quick previews as you edit a script.