CRPropa 2.0 -- a Public Framework for Propagating High Energy Nuclei,   Secondary Gamma Rays and Neutrinos
  Version 2.0 of CRPropa is public software to model the extra-galactic propagation of ultra-high energy nuclei of atomic number Z<26 through structured magnetic fields and ambient photon backgrounds taking into account all relevant particle interactions. CRPropa covers the energy range 6*10^16 < E/eV < A*10^22 where A is the nuclear mass number. CRPropa can also be used to track secondary \gamma-rays and neutrinos which allows the study of their link with the charged primary nuclei -- the so called multi-messenger connection. After a general introduction we present several sample applications of current interest concerning the physics of extragalactic ultra-high energy radiation. 
Karl-Heinz Kampert, J\"org Kulbartz, Luca Maccione, Nils   Nierstenhoefer, Peter Schiffer, G\"unter Sigl, Arjen Ren\'e van Vliet
astro-ph.IM astro-ph.HE