Flameshot - Powerful yet simple to use screenshot software for Linux.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
shotgun (screenshot utility) - Minimal X screenshot utility written in Rust
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Gnome Screenshot - GNOME Screenshot is a utility used in the GNOME desktop environment for taking screenshots.
LightShot - The fastest way to take a customizable screenshot.