Simuscale is a C++ simulation framework that models both intra- and extra-cellular processes at different time scales. Its decoupled architecture allows for an easy and parsimonious extension of the model with e.g. a new kind of intra-cellular formalism.
Simuscale is currently under active development, it will be distributed in the form of a Software as a Service (SaaS) and possibly as a standalone application for specific needs.
Simuscale is hosted at https://gforge.inria.fr/projects/simuscale/