DiscStation is a partially-functioning map available on the /tg/ codebase as an alternative to the default map. It is currently maintained by JackHunt.
The map is based around large, 5-wide corridors and spaced out departments to distribute traffic evenly. For speedy transportation around the station, transit tube stations are arrayed around the inside and there is a transit hub on the tip of the Starboard arm. Escape pods are located at the top of each arm, at arrivals on the base of the Starboard arm and below recreation at the aft of the station. Maintenance is much less angular than on other maps and often bends and twists making it hard to keep track of targets and hard to navigate speedily.
Feedback is welcomed in this thread on the tgstation forums.