93 The current development of GIS application focuses more and more on open source development and OGC-conform interoperability. The deegree project has so far contributed with some more popular OGC services like WMS, WFS, WCS and CS-W. deegree is currently the most comprehensive open source implementation of OGC services. In its second release, deegree brings out a revised API, new services (e.g. a Web Processing Services) as well as many new features in addition to the known ones. The presentation will introduce deegree2 and some of its most important services. An overview of the deegree API and its use on the client side will be given. This will be illustrated with a few case studies. FOSS4G2006 - Free And Open Source Software for Geoinformatics Session 10 : SDI-OGC Markus Mueller mueller@lat-lon.de Ugo Taddei taddei@lat-lon.de Markus Mueller mueller@lat-lon.de Ugo Taddei taddei@lat-lon.de <MaKaC.conference.ContributionType object at 0xb4937dec>