QuIP provides an interactive environment for computing and presenting images and image sequences, manipulating and storing arbitrary data, and general scientific computing and plotting. The current release supports unix-like operating systems (tested on Linux and Mac OSX), and Apple's iOS mobile operating system. GPU acceleration is supported with either CUDA or OpenCL. There is built-in support for psychophysical experimentation, with general-purpose staircase routines and analysis of psychometric functions. - View it on GitHub