Simbio was originally developed on the basis of C++ and Fortran routines. The source code is publicly available and can be downloaded via sourceforge (http://sourceforge.net/projects/neurofem-simbio).
Enthusiastic and gifted developers are always invited to become members of the developers group - please, get in contact with both Hermann Sonntag and Carsten Wolters (Email: hsonntag 'at' cbs.mpg.de and carsten.wolters 'at' uni-muenster.de).