JA Sensei - Complete suite to Learn Japanese !
Metastream - Watch streaming media with friends
Akebi Japanese Dictionary - Offline Japanese-English kanji dictionary.
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
Kosmi - Digital Hangouts Reinvented