PNGGauntlet
Free
PNGGauntlet is a PNG compression app for Windows.
Caesium
Open Source
Caesium is an image compression tool.
OptiPNG
Open Source
OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information.
Compare PngOptimizer with alternatives
Compare PNGGauntlet and PngOptimizer and decide which is most suitable for you.
Compare OptiPNG and PngOptimizer and decide which is most suitable for you.
Compare Caesium and PngOptimizer and decide which is most suitable for you.