Agate Publishing is starting a new venture, Agate Publishing Academy. It is designed as a training network for people interested in publishing who may not be able to do a master's level program. Agate has always had a strong internship program, and they're looking to expand what they've learned over the years as a certificate-level program with publisher partners who are willing to support interns in this way.
There is some more information here FAQ for Training Intern Network (agatepublishingacademy.com)
And, for info about Agate, in general Home - Agate Publishing