イメージオプティム by コルネル Lesiński and contributors is a GUI for 3rd party utilities:
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OxiPNG by Josh Holmer,
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pngquant by Kornel Lesiński,
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PNGCrush by Glenn Randers-Pehrson,
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MozJPEG by Mozilla and contributors,
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Guetzli, Zopfli by Jyrki Alakuijala, Lode Vandevenne,
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AdvPNG by Andrea Mazzoleni, Filipe Estima,
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Jpegoptim by Timo Kokkonen,
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Gifsicle by Eddie Kohler,
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SVGO by Kir Belevich,
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svgcleaner by Evgeniy Reizner,
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and PNGOUT by Ken Silverman.
イメージオプティム can be redistributed and modified under GNU General Public License version 2 or later.
Bundled PNGOUT is not covered by the GPL and is included with permission of Ardfry Imaging, LLC.