Coursera is very popular among my peers. In particular - I'm not 100% certain how helpful it is, because I haven't done it myself but - a lot of my peers loved Edivet from the University of Edinburgh https://www.coursera.org/learn/becoming-a-veterinarian
It's free (from the looks of things there is some cost associated with it but I'm not sure where exactly; maybe for the certificate?), has a shareable certificate (again, I'm not sure who valuable this is to employers or anything) and apparently 21% of people got a tangible career benefit from the course.
If you haven't come across it already, at the very least I'd say it is worth investigating.