termfx
TermFX is a module that a program written in lua can use to create text based user interfaces. At its core it uses termbox, but provides a more lua like API, and some additional stuff like offscreen buffers and xterm color management.
Documentation
If you want to know a little more (even though it is not all that relevant any more to the lua version), you can check out the original termbox.h.
Download
Get it from the git repository at Codeberg, or by installing it from the luarocks repository.