image optimizer for web
pingo
pingo is a command-line, lossless and lossy image optimizer (PNG, JPEG, WebP, APNG) designed to be used for web context
pingo — optimized 400 PNG files losslessly for web
pinga (GUI)
pinga is an easy to use GUI, experimental PNG and JPEG image optimizer which use some pingo's implementations
pinga — optimized 30 PNG files (auto lossless/lossy)