Evaldraw allows you quickly write small programs in its C-like language. It supports static variables, enums, arrays, functions and just recently structs.

Your code is re-compiled every time you type a character! Goodbye tedious compile times! A simple program that draws a gradient with the mouse: code: () { setcol(mousx/xres255,mousx/yres255,255); drawsph( mousx, mousy, 10 ); } Evaldraw lets you quickly test an idea. Its great for prototyping. There are built-in functions for drawing circles, lines, cones, and some OpenGL primitives (GL_LINES, GL_TRIANGLES, GL_QUADS ).

In addition to being a programmingenviroment you can evaluate functions in 1D, 2D and 3D! It even has a buildt in keyboard for playing music. This is so you can write your own instruments as a function of time and amplitude in the 1D mode. Evaldraw has a lot of great examples and games included.