Fontbakery is Font QA software that can be run on the command line or on the Font Bakery dashboard. Font Bakery Dashboard
Fonts are complicated and as such can become tedious to check thoroughly. Imagine you've just drawn your superfamily of 81 styles and now it's clipping in legacy Microsoft Office programs from before 2013. Why? Maybe you need a DSIG table, but that wasn't on the list of things to think about when you made your masterpiece. Fontbakery will check for you.
Fontbakery is part of a development cycle. As type designers sometimes we don't think of our fonts as software. They're art or they're a tool or they're some other abstraction. The problem is (all theory aside) in practical terms fonts are software. we need to be able to test them as software. Succinctly Font Development is Software development.
For a thorough set of documentation and a video saying essentially what I've written above by Fontbakery maintainer Felipe Sanches, please read the docs.