For a long time I was looking for a suitable tool that helps taking screenshots. And I can tell you there are a ton of them out there. It was like looking for a needle in a haystack. Either the tool was lacking a feature I needed, or it was overloaded with stuff I would never need. Other criteria besides the scale of features for a tool like a screenshot taker are:

• leightweight app with a small footprint
• ease of use (as few interactions, like mouse clicks or key-strokes ts as possible)
• modern appearence
• constant further development

Finally it looks like I found what I was looking for: WinSnap from ntwind software.

For a software developer a good screenshot tool can save a lot of time. For me it is especially useful as it helps me in communication with quality assurance. For this kind of use it is essential to be able to make annotations right on the screenshots, like drawing basic shapes and writing short text lines. Yes, I'm asking for a built-in paint app.
Well, I didn't find a tool with this capability yet. And WinSnap doesn't offer it either. But what it offers, is a very valuable feature, that I missed in the other apps I checked out: You can configure external tools. The external tool runs using the menu or a keyboard shortcut. So I just configured Paint as the external tool that executes with the screenshot when I hit Alt+1. This is definitely the feature I use most often. And also was the feature which made me finally decide in favor of WinSnap.