Memrise courses that cover Duolingo's vocab to help reinforce the words via SRS:

Spanish - http://www.memrise.com/course/342610/duolingo-spanish-vocabulary-incomplete/

French - http://www.memrise.com/course/61965/duolingo-french/

German - http://www.memrise.com/course/335725/comprehensive-german-duolingo-vocabulary/

Italian - http://www.memrise.com/course/64852/duolingo-3/

Portuguese - http://www.memrise.com/course/359836/duolingo-brazilian-portuguese/

Dutch (split into two parts for some dumb reason):

http://www.memrise.com/course/356226/duolingo-dutch-for-english-speakers-2/
http://www.memrise.com/course/641637/duolingo-dutch-for-english-speakers-part-ii/

Irish - http://www.memrise.com/course/375351/duolingo-irish-2/

Swedish - http://www.memrise.com/course/462533/duolingo-swedish/

Danish - http://www.memrise.com/course/591037/danish-duolingo-4/

Turkish - http://www.memrise.com/course/783376/duolingo-turkish-11/

Norwegian - http://www.memrise.com/course/691524/duolingo-norwegian-2/

Esperanto - http://www.memrise.com/course/709970/duolingo-esperanto-5/

Ukrainian - No complete courses of this type exists.

Russian - http://www.memrise.com/course/378212/duolingo-russian-full-audio/