There are dozens of to-do-list apps out there, but Any.do stands out for hitting the delicate balance between clean and robust so that it's easy to set up lists organized the way you want without too much clutter. The app lets you set up lists for "today," "tomorrow," "upcoming" and "someday" that you can see at a glance and collapse or expand as you wish. You can also view your tasks by category -- personal, work, etc. Any.do syncs signed-in users' lists with an online account in the Chrome browser, or it can hook into a Facebook account. Free, for Android and iOS devices.
Managing classes can be tricky, particularly in high school and college when students are juggling the notes, schedules and projects for many advanced courses. StudyBlue works with schools to let students organize their notes and make study guides for specific classes and even share materials such as syllabi with classmates. The app also lets you make flashcards for any time you're on the go and need to get in a couple of study sessions. Plus, StudyBlue will keep a track record on your flashcard sessions, so you'll be able to see your progress over time. Materials can be public or available to classmates. Free, with in-app purchases, for Android and iOS devices.