DuckCapture is a simple screen capture tool that allows you to capture screenshots through easy presets.
DuckCapture lets you capture a window on your screen, a region of your screen a rolling screen or full screen. In addition, you can modify your captured area and add more areas to one image. There are some limited annotation tools. DuckCapture allows you to add annotations and informative text by highlighting target areas.
You can customize the output format as Bitmap, JPG or PNG and also assign shortcuts to captures. That's about all DuckCapture offers but if you have any scripting knowledge you can write your own scripts to extend its functionality. Although you can capture rolling screens, there is no way you can extend DuckCapture to capture video screenshots, however.
Although DuckLink is handy and easy to use, it can't compare with more professional tools such as SnagIt