Mod_gfx is a project mainly written in C, based on the GPL-3.0 license.
mod_gfx module for Apache webserver
mod_gfx
mod_gfx was written by Michael Spiegle
mod_gfx provides a way to perform fast on-the-fly image resizing from within apache.
The homepage is at http://nauticaltech.com/software/mod_gfx