XEALbc for Mac

From The La Jolla Underground:

XEALbc is a calculator utility for Mac OS X that goes beyond simple emulation of a pocket calculator. Sporting a text-editor type interface with multiple, savable document windows, you can type in whatever complex equations you desire, and quickly edit what you have already typed. This is a front-end to the powerful bc command line tool on Mac OS X, which implements an arbitrary precision numeric processing language. XEALbc features multiple input and output bases (2 to 16 for input, 2 to 2,147,483,647 for output), arbitrary precision operations (scale from 0 to 2,147,483,647), function declarations (may be recursive) and much more. If the C/C++ preprocessor is installed (included with Apple's developer tools), you can use it to handle #define and #include statements for creating constant values and entire math libraries (some samples included).