'besides' is a more informal way of saying 'as well as', 'in addition to'. Your sentence sounds like it is in a CV and so would need to be more formal:
In addition to working on JSP,Servlet software, I also have a sound knowledge of Struts,Hibernate and Framework.
Besides knowing English,I also know German lingo.
Speaking very informally, you might say:
Said to a friend: "Besides English, I also know German, so I was OK in Berlin, but I went on to Italy and I don't know a word of the lingo."
'lingo' referring to the language spoken in a country is very, very informal.