Capture All 2.30 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this software for Mac is Jiulong Zhao. The program is included in Design & Photo Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Captures all your open windows with just one click!
Yes, grab screenshots of All your windows Individually and Simultaneously in One Click!
As you know, OS X is equipped with a screenshot function. By default, the hotkey "command + shift + 3" will take a screenshot of your entire screen.
You may want to check out more Mac applications, such as Screen Captures, Voila: Powerful screen capture & screen recorder for Mac or Screen Captures Pro, which might be related to Capture All.
Screen Capture