acme-tiny is another good and simple client, which I personally prefer.
I've recently compared 10 different Let's Encrypt / ACME clients: https://www.metachris.com/2015/12/comparison-of-10-acme-lets...
I've recently compared 10 different Let's Encrypt / ACME clients: https://www.metachris.com/2015/12/comparison-of-10-acme-lets...
https://github.com/nuxi/acme-tiny
For now I've just done enough to get a cert for a mail server.