OpenDream is an open source recreation of the BYOND game engine. Current major goals include running Space Station 13 and improving the DM development experience.
We currently have three test servers running 24/7. You can play them by downloading the Space Station 14 launcher and searching the servers list for "OpenDream". You may also connect directly with the below URLs:
OpenDream is still in development so expect plenty of smaller things to not work properly.