ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Bulk Resize Photos - Resize large photos in bulk
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
PQINA Photo Editor - A free, fast, mobile-friendly, online photo editor to quickly edit pictures.
LightShot - The fastest way to take a customizable screenshot.