I'm most active on Incubator (which is best described as "the wiki where you can start a Wikipedia in your language, if it doesn't exist yet"), where I'm admin, bureaucrat and importer. Since March 2012, I'm a member of the Language Committee. I'm also a sysop on Tetum Wikipedia, Swati Wikipedia and Swati Wiktionary, although I do not speak the language of the latter two. Also I do some edits in German Wikipedia, as that is my native language.
Globally I'm a steward (since February 2013); some more information can be found (in several languages, even) in my steward elections candidature statement.