A quick Google search of “theatre apps” led me to these top apps. There are many more technical theatre apps out there that I didn’t include, most of which are tied to specific brands and almost all at a cost. And there are also many other apps out there for specific theatres or for theatre reviews. Please feel free to add any of your favorites to the comments section to help create a more comprehensive list!
Free
Light Calc Lite: Calculates diameter of light based on angle and distance
Shakespeare: The complete works!!!
Paid
Gel Swatch Library: $9.99, gel swatchbooks for Lee, Rosco, GAM, and Apollo
At The Booth: $.99, guide to 1/2 price tickets for Broadway shows. For iPhone, Blackberry, and Android
Rehearsal 2: $19.99, upload sides, record lines, great for memorization
Scene Partner: $4.99, record lines for memorization assistance.
ETC Remote Focus: $49.99, use any iDevice as a remote focus controller
