[sasvari]

there is also khard [0]

[0] https://github.com/scheibler/khard

[qudat]

This is what I use for my CLI email client (aerc). I keep mail and contacts sync'd using fastmail as my backbone with a couple of crons using:

- https://github.com/pimutils/vdirsyncer

- https://isync.sourceforge.io/mbsync.html