Screenshot Crop For Mac 1.2 can be downloaded from our website for free. The actual developer of this software for Mac is Japplis.
From the developer:
Screenshot Crop detects when an image is captured in the clipboard and will show the clipboard image content for cropping.
Using the guided lines, easily select the part(s) of the image you want to keep. Once the image is cropped, Screenshot Crop is minimized so that you can continue on the software you took the screenshot from.
Fremium: 30 crops per month free, then a watermark is applied to the image.
You may want to check out more software for Mac, such as Screenshot Maker, Screenshot Monitor or Awesome Screenshot -- Capture, Annotate and Share screenshot, which might be related to Screenshot Crop For Mac.
General
Screen Capture