As it happens, this site contains finished maps only. Yet, there are many maps around in beta stage. Some have been in such stage for years and most likely will remain so. I thought we could create a thread with your recommended maps still in beta stage.

To kick the conversation off, a map with a great gameplay and design, done by experienced mappers, is called "Hektik" (ws.q3df.org/map/hektik_b3/). It was last updated on 2013. Votes and downloads on the linked site suggests is a popular one.

Looking forward to see your favourite beta maps.

yeah, I like hektik too. another one I play on a lot is astronomybeta

Hey, that's a cool map! Added to my list! (it doesn't show in the main menu though)
Edited 10.58 minutes after the original posting.