Download of ProtobufViewer 1.0.8 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. The actual developer of this free Mac application is liudanyun.com. ProtobufViewer for Mac relates to Developer Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
Protobuf Viewer is a tool that lets you view the Google protobuf encoded message. The application auto detects the possible scalar type for you. However, you can change the scalar type on the fly if desired. Protobuf Viewer also supports parsing incomplete protobuf messages.
You may want to check out more software for Mac, such as Url Extractor X, Boks or JustinmindPrototyper, which might be similar to ProtobufViewer.