PngOptimizer
ImageOptim
pngquant
TinyPNG
OptiPNG
Caesium Image Compressor
PNGGauntlet
pngcrush
ConvertIcon!
Faviconer
ConvertICO.org
Ordinatore
Online Image Converter
GenFavicon
safetoconvert
ToYcon
PngOptimizer ConvertIcon!Based on our record, PngOptimizer seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Personally, I like the psydk PNGOptimizer https://psydk.org/pngoptimizer for PNG files and FileOptimizer for JPEG files. The latter will work on all kinds of files but is exceptionally slow on PNG files. You can mess with the settings so it doesn't take so long but I don't bother. Source: about 2 years ago
ImageOptim - Faster web pages and apps.
Faviconer - Faviconer.com, or favicon generator, is online tool for creating favicon.
pngquant - command-line utility and library for lossy compression of PNG images
ConvertICO.org - Create icons from png, jpg or bmp images easily.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Ordinatore - Those who want to tidy up their Macs will surely love this application.