This RPN calculator takes full advantage of the new Full Screen Mode in Lion. And when you're not using the calculator in full screen mode, the window is fully resizable.
The RPN behavior in this app is based on classic HP calculators. All the essential functions for everyday calculation are included. All memory registers are saved when you quit the app.
v3.7 [Jan 28, 2013]
The application now stays running when the window is closed. This means that if you use the calculator and then close the window to do something else, you can go back to the calculator without having to relaunch the entire app.
VisualVM
