We've recently started the development of Project: Rosenbaum, in the mapping department atleast. We're still in need of alot of help because this is quite a large project.
Not only having a singleplayer, we're planning on including a multiplayer and Co-Op!
If you're wanting to help in any way such as coding, concept artist, modeling; we could use it! Just recently have we acquired a voice actor, even before the development had begun! So if you're willing to provide any help, please send me an email at contact@sws.hl2files.com or head over to our Dev Blog and click the "Contact Me" link on the menu.
Thanks in advance,
Ethan 'MiKol' Lerch