There's also Mates [1]. Less mature, very simple, but it's what I personally use.
I try to steer away from relying on CLI tools implemented in python or ruby: at the system level they always seem to cause dependency hell problems eventually. Mates is implemented in Rust, so it's compiled, which is primarily why I chose it.
An important related project is vdirsyncer [2]. Ppl, khard, and mates all store data in vcard format but don't talk to APIs or sync anything. Vdirsyncer can sync your vcard collection with your email provider or what have you.
[0] https://github.com/scheibler/khard