What are some alternatives?
When comparing FileOptimizer and pngquant, you can also consider the following products
ImageOptim - Faster web pages and apps.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
ImageMagick - ImageMagick is a software suite to create, edit, and compose bitmap images.
PNGGauntlet - -Combines PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs
Free UPX - Graphical interface for the UPX packer, UPX 3.91w, UPX 3.92w, UPX 3.93w, UPX 3.94w, Ultimate Packer for eXecutables, EXE packer