My game engine is capable of using actual bitmap fonts for text display. Often the term “bitmap font” gets to misused to mean modern vector fonts in the style of retro pixelart, but I haven’t yet included support for that in my engine (will be later on, primarily for accessibility and language reasons).
So far, I was able to hunt down a lot of monowidth and one duowidth font, with the latter will be used for better language support, but currently I have to rely on converting vector fonts with BMFont for the most part, and the results are very mixed. Old Microsoft fonts (Arial, etc) still have the font hinting support and looks good, but there’s an obvious MS issue.
I’ll see if GNU FreeFont or anything else does still have hinting or not, then export that with BMFont. However, some free historical solution would be the best due to the whole retro theme of the game engine.