SymPy is a Python library for symbolic computation. The stated goals of the library are to become a full-featured computer algebra system and to keep a simple code base to promote extensibility and comprehensibility.
R (programming language)
Really Slick contains free 3D OpenGL screensavers. All of these savers are colorful and exhibit rich animation that never repeats. Some are based on classic screensaver themes, such as fireworks, swarms, and plasma.
Grid Paint is an online drawing tool using various types of grids (squared, triangular, hexagonal). Drawing by grids is something like pixel art, but in pixel art you have only square pixels. Here you have also triangular or hexagonal pixels.
Unleash your inner gridded side by effortlessly drawing on an angled isometric grid, creating beautifully precise geometric artwork. IsoSketch is simple and a blast to use. Yet you have full control with color, opacity, fills, strokes, layers, background images, and much more.
Inspiral creates breathtaking, geometric line drawings using a clever system of interlocking gears. You'll be delighted and surprised as complex, captivating designs emerge under your fingertips.
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