Newly adapted IBM XWork Server is basically, the Lotus Domino 8.5x application server running of course without the email stack. The server license can be purchased for just about $2,000 according to Ed Brill’s Blog Post.
The XWork Server installation is allowed to have up to 4 applications, where an application is defined as a group of 1 to 3 NSF databases. Note, systems databases do not count. Therefore, an XWork Server install can have a total of 16 production databases/applications.
As being just a Domino server with license restrictions, the XWork Server can work with any regular Domino application–XPages, Lotusscript, @functions.