All the individual executables are marked EXCLUDE_FROM_ALL, but the added Tools custom target is marked ALL. The only visible effect of this is that ConvertColorCursors does not get built by default, since all the other tools are dependencies for the Resources or Tools targets, which are both built by default. Otherwise, the benefit is simply to keep the dependency tree clean. Only three targets are built by default: Aerofoil, its resources and the conversion tools. Everything else is built to satisfy dependencies.
About Aerofoil
Aerofoil is a port of John Calhoun's Glider PRO, the classic paper airplane game for Apple Macintosh computers released in 1994.
The port features a 90's-style GUI, gamepad support, high-quality upscaling and color correction, a full port of the level editor, a set of import tools for unpacking and converting the vast majority of existing community content, and a new touchscreen interface for mobile devices.
To play:
Windows, macOS: Download from the Releases page, or from https://galeforcegames.itch.io/aerofoil
Android: Download from Google Play Store: https://play.google.com/store/apps/details?id=org.thecodedeposit.aerofoil from itch.io: https://galeforcegames.itch.io/aerofoil, or from the Releases page
Browser (HTML5): Visit https://galeforcegames.itch.io/aerofoil