Download of WebPonize 2.6 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.
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. The application is included in Design & Photo Tools. This free Mac application is an intellectual property of 1000ch.
From the developer:
WebPonize is an open source Mac OS application for converting images into WebP. The application helps you to reduce the size of your pictures. The application has an easy to use and intuitive interface, just drag and drop your images into WebPonize.
You may want to check out more software for Mac, such as Warranty Hero, Pneumatic Image Converter or PNG32 - Alpha Channel PNGs - Made easy!, which might be related to WebPonize.