ImageOptim - Faster web pages and apps.
Imagecompressor.io - Tool to compress jpeg & png images online.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
TalkJarvis Image Compressor - Online Image Compressor – Compress any type of image online
Oxipng - Oxipng is a multithreaded lossless PNG compression optimizer. It can be used via a command-line interface or as a library in other Rust programs.
HitPaw Compressor - HitPaw Compressor is the most effective and powerful software that can easily compress videos or images with several clicks in seconds.