Radical Image Optimization Tool (RIOT) is a free image optimizer that will let you to visually adjust compression parameters.
AppCompactor
Open Source
AppCompactor allows you to easily compress applications to decrease size on disk and increase performance.
ImageOptim
Open Source
ImageOptim makes images load faster. Removes bloated metadata. Saves disk space & bandwidth by compressing images without losing quality.
Caesium
Open Source
Caesium is an image compression tool.
Compare FileOptimizer with alternatives
Compare RIOT - Radical Image Optimization Tool and FileOptimizer and decide which is most suitable for you.
Compare ImageOptim and FileOptimizer and decide which is most suitable for you.
Compare AppCompactor and FileOptimizer and decide which is most suitable for you.
Compare Caesium and FileOptimizer and decide which is most suitable for you.