These fonts include: PixeloidMono.bdf
This program makes use of the Pixeloid Mono font, created by GGBotNet and licensed under the SIL Open Font License, Version 1.1.
This font can be found at https://ggbot.itch.io/pixeloid-font.
These fonts include: Tiny-4x6.bdf, Small-5x7.bdf
These bitmap fonts are obtained from https://github.com/hzeller/rpi-rgb-led-matrix/tree/master/fonts, and were created for the X11 project.
These fonts are in the public domain.