Flameshot - Powerful yet simple to use screenshot software for Linux.
shotgun (screenshot utility) - Minimal X screenshot utility written in Rust
HotShots - Hotshots is a screenshot tool with some editing features.
Spectacle App - Move and resize windows with ease.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image