MuPuPriNT
A primality/compositeness tester for different types of numbers.
MuPuPriNT (Multi-Purpose Prime Number Tester) is a primality and compositeness tester for many different types of numbers.
It is basic, yet full-featured, and offers several different testing methods for each type of number.
MuPuPriNT is built on the GNU Multiple-Precision (GMP) integer + rational library, and is available for Windows, OS X, and Linux. Source code is available as well, and can be built on any machine with Qt installed.