Interfaz gráfica para Zoopfli, PngOut y OptiPng. Esta interfaz reduce el tamaño de las imágenes PNG sin sacrificar la calidad aplicando en secuencia las tres herramientas.
Zopfli Compression Algorithm was created by Lode Vandevenne and Jyrki Alakuijala, based on an algorithm by Jyrki Alakuijala; its open source code is on https://github.com/google/zopfli
PngOut was created by Ken Silverman: http://advsys.net/ken/utils.htm
OptiPng is licensed by Cosmin Truta and the Contributing Authors: http://optipng.sourceforge.net/