For nim i like this one: https://github.com/johnnovak/illwill https://github.com/johnnovak/illwill It is immediate mode so you render the entire UI every tick,

For nim i like this one: https://github.com/johnnovak/illwill https://github.com/johnnovak/illwill It is immediate mode so you render the entire UI every tick, though it is smart enough to not actually redraw things that didn't change.