What are some alternatives?
When comparing pngquant and ImageOptim, you can also consider the following products
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
PNGGauntlet - -Combines PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs
CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
OptiPNG - OptiPNG is a command-line PNG optimizer that recompresses image files to a smaller size, without...
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...