Lutece was originally a Java CMS realized by the City of Paris for its own purpose in 2001 and has been distributed as Free Software since 2002. Lutece runs or had powered large French web sites such as Meteo France, Notaires.fr, GeoPortail, the city of Paris or Marseille. It offers for several years a rock solid modular framework to build back office applications and online services. Fully "responsive web design" it integrates latest technologies of the Java World (authentication, search engines, workflows, reporting, machine learning, ...) through a large panel of plugins.