DEUS aims to become one of the reference tools in the field of complex system simulation. It provides a simple Java API which allows to implement nodes (i.e. the parts which interact in a complex system, leading to emergent behaviors.. humans, pets, cells, robots, intelligent agents, etc.) events (e.g. node births/deaths, interactions among nodes, interactions with the environment, logs, etc. - briefly, whatever you want!) processes (stochastic or deterministic, they regulate the timeliness of events) Configuration scripts for simulations must be written in XML (using the DEUS schema). In the near future a graphical editor will be introduced. Currently you can checkout the source code, which comes as an Eclipse project and includes many examples. Soon, the examples will be removed from the source repository and released separately. If you do not want to checkout the source code, you can use the deus-x.y.z.jar which is available in the downloads section. A paper introducing DEUS has been presented at SIMUTools 2009, in Rome. It is a good reference to understand the phylosophy and the architecture of DEUS. You may find it in the downloads section. NEWS In version 0.4.3 we have introduced a new implementation of the event queue, that now is much more efficient: the insertion of a new event in the right position, according to the timestamp, costs now O(logN) - while previously the cost was O(NlogN). The Visual Editor has been included in the source tree, and the related User Manual (italian version) has been added to the "Downloads" section. There you find also the latest version of deus-lib.jar.