OptiPNG - OptiPNG is a command-line PNG optimizer that recompresses image files to a smaller size, without...
ImageOptim - Faster web pages and apps.
JPEG Resampler - Jpeg Resampler, nástroj pro konverzi a změnu velikosti obrázků, snadné použití, zdarma
jStrip - jStrip is a free tool to reduce the file size of JPEG images without sacrificing image quality.
pngquant - command-line utility and library for lossy compression of PNG images
ImageAlpha - ImageAlpha is a GUI for pngnq and pngquant.