ByoDyn (http://cbbl.imim.es/ByoDyn) is a software tool for the study of biochemical networks within the framework of systems biology. SBML compatible, ByoDyn is a group effort of the Computational Biochemistry and Biophysics Lab.
Molecular Graphics and Dynamics. Molecular model builder. Part of the Ascalaph Designer http://sourceforge.net/projects/asc-designer/ project. Windows & Linux.