stbi-1.33 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c

stbiw-0.92 - public domain - http://nothings.org/stb/stb_image_write.h

stb_truetype.h - v0.6c - public domain
LICENSE
   This software is in the public domain. Where that dedication is not
   recognized, you are granted a perpetual, irrevokable license to copy
   and modify this file as you see fit.

Ogg Vorbis I audio decoder  -- version 0.99996
Written in April 2007 by Sean Barrett, sponsored by RAD Game Tools.
Placed in the public domain April 2007 by the author: no copyright is
claimed, and you may use it for any purpose you like.