The Jetsons

The Jetsons are a mapping clan from Skulltag, although most of their user base are from Doomworld. The leader of the Jetsons is a highly respected Doomworld mapper, and member, esselfortium.

Projects
The Jetsons' flagship project is "The Jetsons DM Pack 5", commonly referred to as SpaceDM5. It is an ongoing project which currently consists of 33 maps; as the name suggests, they share a common theme (outer space). It is available for download here.

Several of its individual members have also been involved with many notable Doom-related releases, such as the 32in24 series.

Links
Jetsons Website

SpaceDM5 Project Thread