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SPECIAL MENTION: Students’ and teachers’ days of carrying heavy textbooks and binders may be numbered. Flexcil, a notetaking app available on iOS and Android, provides students, professors, and more the ability to seamlessly read, annotate, and take notes of PDF documents on their devices—a big improvement over similar apps, most of which can perform just one of these functions at a time. Selected as a featured app by Apple, Flexcil ($6.99-$8.99 for the standard version) is used by more than 4 million people worldwide. —Mariah Espada
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