FNTTools is a command line application for converting and inspecting AngelCode bitmap fonts (.fnt). It is available for Windows (x86 and ARM), macOS (x86-64), and Linux (x86-64 and ARM). If you have any ideas for new functionality, please create an issue. I don't intend to add generating bitmap fonts, however. Check out my library SharpFNT to read and write AngelCode bitmap fonts in your own C# projects.
FNTTools can be downloaded from the releases section. The executables are self-contained so downloading the .NET Core runtime is unnecessary. A side effect of this however is that the executables have a file size of about 30-40MB.
Available here.
Licensed under MIT.