Gen* is an open source java library that make it possible to generate spatially explicit and socially connected synthetic population using any survey and GIS data. The toolkit is also available as a Gama plugin and can be used through the Kepler workflow management tool. How aim is to provide to computer scientist and none programmers the access to state of the art algorithms to solve synthetic population generation, explicit localization and network generation of synthetic entities. The library is under development but already provide several algorithms for each of this three part: gospl, spll and spin. See https://github.com/ANRGenstar/genstar for further information.