On Thursday, Apple gathered 19 leading productivity apps and put them under a banner sale called "Get Productive." Among the better-known offerings are the popular calendar program Fantastical 2 for iPhone now $2 (normally $5), to-do app Clear (also now $2 versus a normal price of $5) and Duet Display, a new app that allows users to connect their iPad to a Mac and use the former as a second display (normally $15, now on sale for $8).
