BIG NEWS! In the current beta version of cobalt (a secret beta, you need a password to join) players can finally play workshop maps online! Join our discord so you can learn how to access it > Cobalt Discord Server
Listed here are all the maps that you can download in the Steam workshop. If you click on the images you'll access the info page for each of them, which contains changelogs, images, videos, and a download link for the map files so you can open the map in the editor in case you're interested in checking out how something works!