Masses and Springs simulates point masses connected by springs with a given equilibrium distance. The plotting is rendering using the PyQtGraph package, which utilizes PyOpenGL.

Bouncing balls are similiar simulations using the MATPLOTLIB plotting library. There are both 2D and 3D simulations

L-system simulates a fractal tree pattern generated by recursive substitution of a simple rule to generate a long "sentence" of commands. These commands take the form of "turtle graphics"-like commands, but with save and restore methods as well.

• the first file uses the turtle python libray
• the second uses matplotlib to imitate the turtle

Lorenz is the classical Lorenz attractor demonstration. Here I use matplotlib's animation function.