Download of Wayback 2021.2 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is an intellectual property of net.otzberg. Wayback for Mac lies within Developer Tools, more precisely Webmaster Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
Wayback was designed to give you easy and convenient access to the Internet Archive's Wayback machine. Whether you want to see what your favorite website looked like 5 years ago, or you are doing research and want to ensure that a specific page gets added to the archive right now, this extension is right for you.
You may want to check out more software for Mac, such as Wayback Machine, which might be related to Wayback.