LibGeoDecomp (Library for Geometric Decomposition codes) is an auto-parallelizing library for computer simulations. It is specifically targeted computational science applications in the context of supercomputers and heterogeneous systems. The library eases development of such tightly coupled codes by essentially taking over the parallel programming: it handles both, the parallelization itself and parameter tuning. This enables scientists to focus on their simulation code, rather than the technical details of the parallel computer. WWW: http://www.libgeodecomp.org/