I managed to find time to polish an old pet project of mine, a cross-platform C99 library to create unicode text graphics easily, on UTF-8 capable terminals.
I have adopted REXPaint as a natively supported editor to create assets.
I've used the project as a learning workbench over the years till it became a thing of its own, so it's a bit of niche tool. It requires a basic level of proficiency in both C and CMake.
It can do realtime games too, if the user knows what is doing. The repo provides some examples.
It's called
VisualT, and the docs are published on
readthedocs.
I've made the logo, the VTCat, with REXPaint :)