Letters from a Stoic.

A good collection of Seneca's letters, which were more likely meant as publicly-read essays than letters themselves. Not all of them can be found here; this collection has approximately forty of them. Yet, for a sense of Stoic philosophy, it's well-worth the read.

Definitely not as engaging as Meditations, but still interesting, as much for what it reveals about upper class Roman life as it does about Stoicism.

Heated tubs connected to the ocean, criticism of "night owls", debates about real locations of places mentioned in the Odyssey that we're still having today, and people gossiping about Sappho's sex life.

It really makes me feel like not much has changed between now and then other than the technology of distributing information.