Optimage - Advanced image optimization tool
Squash 2 for Mac - The easiest way to compress and optimize images for the web
Aerate for macOS - Ridiculously good lossless image compression
Icecream Image Resizer - Image resizer by Icecream Apps is a program to resize images fast and free. Windows version. Free Download.
Imagify - Optimize and resize images online and through your CMS.
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.