With the thousands of educational apps vying for the attention of busy teachers, it can be hard to sift for the gold. Michelle Luhtala, a savvy librarian from New Canaan High School in Connecticut has crowd-sourced the best, most extensive list of appsvoted on by educators around the country.
http://blogs.kqed.org/mindshift/2014/06/apps-that-rise-to-the-top-tested-and-approved-by-teachers/