SIFTING THROUGH THE STACKS: Overwhelmed by your virtual library of apps? Librarian Michelle Luhtala comes to your rescue with a crowd-sourced list of tools favored by educators, reported on KQED MindShift. Her list covers apps tailored for a variety of ages, skill levels, and classroom model (many of them free!), including coding app Hopscotch, and Symphonizer, which enables music students to turn a page of sheet music with a smile. No offense to the Dewey Decimal System, but we like this type of organization.