1)   Hpmbcalc Hex Calculator 3.22
A programmable multiple-precision hex calculator with many utilities. With it, you can easily perform a lot of big number math and encryption operations, such as: square root, modular inverse; hash make; primality test; hex, dec, oct, bin conversion.

 2)   Hexprobe Hex Editor 2.2
A general-service hex editor, particularly helpful in the areas of hex-byte editing, byte-pattern analysis, for example: IT security.