ImageKit.io - Instant multi-platform image optimization
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Image Resizer for Windows - Lets you resize images by right-clicking.
Piio - Generates responsive images so you don't have to optimize
Icecream Image Resizer - Image resizer by Icecream Apps is a program to resize images fast and free. Windows version. Free Download.
Pixelhunter.io - Free AI image resizing tool for social media