I’ve been talking about this for a while under the name of “that epub validating library”, and now it has a name. That name is FlightCrew. It’s a C++, cross-platform, native code epub validator (it’s also open source). The project is composed of three parts: FlightCrew, the validation library; FlightCrew-cli, the command-line front-end to the FlightCrew library; FlightCrew-gui, the GUI front-end t