JM has released 'Scourge Of Lambereth'. It is a modifed version of 'Scourge Of Lammy' which was released in Feb 2006. It has 17 levels, including some that are modified maps from the original Wolf 3D. There are source code changes like level name at "Get Psyched" screen, seamless levels, new helpart and endart and a new title screen. There's also some new walls, enemies and sounds. Available here.
As with the original 'Scourge of Lammy', the source code has been released for general use though if people use it, they need to mention it in the credits. The source code is available here.