Silesia JUG is one of the biggest Polish JUG's with 150 users. We cover developers in Silesia agglomeration. We're passionate about Java but not only – we love open source and talks about our interests. Our topics are very differentiated, we talked about desktop and web apps, ESB and cloud computing as well as architecture, etc. Our meetings take place in two big Silesia cities: Katowice and Gliwice.