Download of WebPViewer 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Design & Photo Tools, more precisely Viewers & Editors. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X was originally designed by Langui.net.
From the developer:
WebP Viewer is a simple viewer for the WebP image format, which is a modern image format that provides superior lossless and lossy compression for images on the web. The tool is lightweight and fast. It opens with a minimal user interface that is both intuitive and easy to use.
You may want to check out more software for Mac, such as ImageBuddy, particleIllusion or Mazaika, which might be similar to WebPViewer.