I like experimenting w/ open-tunings and making 3-4 string cigar box guitars sometimes but its hard finding good resources for chords and stuff so I made this little app that finds (a lot of) them and can work for any stringed instrument and/or tuning!
You can play with the web assembly version here (its slower than native and slightly buggy from android I've noticed fyi):
https://tkefauver.github.io/Calcuchord
Source is here:
https://github.com/tkefauver/Calcuchord
Try it out and let me know what you think!