National Geographic for Children is available in German. There's some bilingual English sprinkled here and there. The articles are a solid way to build more vocabulary for the intermediate to advanced student. I would recommend that a non-native speaker have a German 4th or 5th grade reading level or it would be a bit overwhelming. The magazine is appropriate for high school German learners. Contact GLP International www.glpnews.com
Kinderseiten, Suchmaschine für Kinder - Blinde Kuh
Princesses Learn German: kids have fun in German through stories, games and songs https://play.google.com/store/apps/details?id=earlylanguage.princesseslearn.english.german=search_result#?t=W251bGwsMSwyLDEsImVhcmx5bGFuZ3VhZ2UucHJpbmNlc3Nlc2xlYXJuLmVuZ2xpc2guZ2VybWFuIl0.