There are several publications describing SProUT and the applications created on top of it.
General Overview for viewing papers which give a walk through the system and the grammar formalism,
Core Technology for viewing papers focusing on the core components on top of which SProUT has been built, or
Applications for viewing publications describing various applications in which SProUT plays a crucial role.
If you use SProUT and you want to cite it, please use the following reference:
W. Drozdzynski, H.-U. Krieger, J. Piskorski, U. Schäfer, F. Xu. Shallow Processing with Unification and Typed Feature Structures - Foundations and Applications. In Künstliche Intelligenz 1/2004. [BibTeX]