We're developing so many great new features that nobody seems to find the time to create a new official release of MATSim at the moment. That's why we are now offering nightly builds of MATSim: Get the newest code with all the fancy new features as well as optimized existing features, neatly packaged in a jar-file, ready for use. See the downloads page for more details how to get the nightly builds and how to use them. You'll find there also a short list of the most important changes since the last release.