[A cautionary note that this site can include pop-up advertising that may not be suitable for students.] Digital Trends suggest 20 apps for teachers: From creating lesson plans and keeping attendance, to behavior records and communicating with students outside the classroom, these apps let teachers harness tech instead of fighting it. Knowing, it turns out, really is half the battle.” Of the 20, 16 are free; the “Splashtop Whiteboard,” which turns a tablet into an interactive whiteboard is $35 but looks enticing nevertheless. Free apps include Classroom Organizer; Subtext, which helps with keeping track of students’ assigned readings; and Trello, which students can use to help them organize and manage group projects.