I love open source. Anytime I can support the little guy I will. If you love open source software you will love Greenshot. It is free and is published under GPL. It is very simple.. you hit print screen ( for me its function + print screen) and you are editing a newly taken screenshot in seconds. I use it basically every day!
When Greenshot needs to be updated you get a little bubble in your systray that lets you know that an update is available. If you want to know what has been updated you can go to their blog for more information.
and don’t forget . if you like the product.. buy em a beer :).