I'm not aware of any real useful "Software" in regard to learning German, though there might be many that promise to help students with learning German.
The internet actually offers many free sites where learners interested in studying the German language can find tons of stuff to improve their skills in reagrd to grammar, reading, comprehension and listening.
Take a look here:
Code:
http://www.google.co.th/search?q=Learning+german+free&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official
