PNGGauntlet
PNGGauntlet isn't being updated anymore. It still works fine but you might want to look at the alternatives listed below!
Alternatives
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Squoosh
Browser
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ImageOptim
macOS
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Trimage
Linux and other Unixes
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PNGOUTWin
Professional PNGOUT for Windows
The software license for PNGGauntlet permits unlimited distribution as long as nobody charges money for it, modifies it, or packages it with other software without my permission. It also frees me from any liability from your use of the software. A copy of the actual license is included in the installation and is viewable from the "About" dialog.