External Review References
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ImageOptim - Faster web pages and apps.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
JPEGmini - JPEGmini - The Photo Optimization Tool Trusted by Tens of Thousands Image Perfectionists
pngquant - command-line utility and library for lossy compression of PNG images
WP Smush - Reduce image file sizes, improve performance and boost your SEO using the free WPMU DEV WordPress...
pngcrush - Pngcrush is an optimizer for PNG (Portable Network Graphics) files.