Alright, so, basiclaly.
Impes (alphastage Hellraiser) is a Unity3d framework, which loads, parses and builds UDMF levels (with some compromises, like usage of internal polyobjects rather than sector floors movement - everything aside from polyobjects is mostly static(i guess you can disable walls)).
Additionaly it loads DECORATE (either for just creating coordinates for your own things to plug in via engine or to load state trees etc).
Here's a video.
Here's a progress on demo game which demonstrates features of Impes, and it's sources will be shipped with it when it's done.