Quizlet is a free flash card, study, and review application.
I-Nigma
I-Nigma is a QR code scanning application that keeps a history of codes scanned.
Drive
Google Drive is a cloud base storage system that allows users to store files and create Word, Spreadsheets, PowerPoints and much more. Users receive 15 GB free.
AP Psych
AP Psychology by Brainscape offers over 1000 flashcards covering psychologist and topics in the field of psychology that are listed on the College Board's official AP Psychology outline (taken from APP description from the Apple Store)
Twitter
Twitter is an online social media and micro-blogging application that allows users to send short 140 character messages called tweets.