How about LightShot for Linux users? Rated 4 out of 5 stars
Very good add-on. I needed one easy-to-use add-on to help one teacher friend to create her presentation for school work. After installing and testing several add-ons, I have tryed LightShot which helped me to do the work instantly and without any problems.
The only con that I have against this add-on is that it doesn't work Linux platform (I use Zorin OS distro). I'm waiting for a Linux version of LightShot.