Website: https://shutter-project.org/
Code: https://github.com/shutter-project/shutter

Starting point: https://build.opensuse.org/package/show/home:Sauerland/shutter
* I am starting with Sauerland's setup and updating for the new 0.99.6 release.

Shutter is a feature-rich screenshot program for Linux based operating systems. You can take a screenshot of a specific area, window, your whole screen, or even of a website – apply different effects to it, draw on it to highlight points, and then upload to an image hosting site, all within one window. Shutter is free, open-source, and licensed under GPL v3.