GNOME Screenshot is a small utility that takes a screenshot of the whole
desktop; the currently focused window; or an area of the screen. … https://www.tromjaro.com/gnome-screenshot/
KSnip
Ksnip is a Qt based cross-platform screenshot tool that provides many annotation features for your screenshots. … https://www.tromjaro.com/ksnip/
Flameshot
Flameshot INSTALL DESCRIPTION: Powerful yet simple to use screenshot software. Features: Customizable appearance. Easy to use. In-app screenshot edition. DBus interface. Upload to Imgur.