The goal of Tempest is to provide a consistent, reliable, multi-language API for generating heat-map images based on coordinate data-sets.

Tempest consists of separate implementations in multiple programming languages (such as Perl, PHP, Python, et cetera) all conforming to a unified API specification. Each implementation can alternatively support any number of different image manipulation libraries (such as GD, ImageMagick, PIL).

Check out the live demo to take it for a spin.