This is a compiled version of GoFont. It contains all the features the original paid version of the app had, but it is unsigned, so you'll likely get a warning from Gatekeeper.
Also, this version uses a Google API key which is limited by a quota (10,000 requests per day). If you want to use your own API key, you'll need to compile your own version. I may add a settings dialog in the future to provide your own.