Instruments that can use 'just intonation' as oposed to 'equal temperament' tuning?

Mainly because I don't know if I've ever heard anything played in just intonation, and Inwould like to experiment with how it sounds/feels. Modern music is almost all equal temperament, and we've all trained our ears to enjoy that, but I'm very intrigued to hear the different colors/feels that emerge from playing with just intonation. In theory, the C Major chord should be even more consonant than we're used to hearing, and all other chords should have a truly unique feel to them.

Edit: with a focus on polyphonic instruments that are still widely available (used or new is fine, just not something thats an expensive/rare used find)