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Flameshot, an Open Source screenshot software
(lemmy.sdf.org)
Features:
- Highly customizable
- In-app screenshot editing
- Upload to online platforms
- Command-line interface (CLI)
Platforms:
- Linux
- Windows
- MacOS
Link: flameshot.org.
You might need some workarounds for it to work. I'm using Sway as my window manager, where the missing piece war the "for_window" bit on this page.
https://github.com/flameshot-org/flameshot/blob/master/docs/Sway%20and%20wlroots%20support.md
Depending on your desktop environment/window manager, you might need some different workarounds.