ProtoFont 2.2 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 software relates to System Tools. We recommend checking the downloaded files with any free antivirus. This Mac app is an intellectual property of Imaja.
From the developer:
ProtoFont is a tool for font browsing and specimen sheet printing. Users can view fonts in various sizes, formats, and contexts.