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Slight tangent: Does anyone know what software this project is using to design this? I couldn't easily tell from their file extensions.

Or rather, do people have general recommendations for good, open source, font designing software on a standard Linux machine?

Fontforge [0] seems to be the one that I've heard about and even played with a bit in the past.

Yep! I build this font in FontForge. Such a simple pice of software.