Python makes a pretty nice interactive calculator. You can do the other way around, too, with the builtin function bin(x). (And there are also hex() and oct() builtins, if you also need to go back ...

Codenamize is a command line tool and Python library that ... and write down than pure numbers, and can be used instead or along UUIDs, GUIDs, hashes (MD5, SHA...), network addresses and other ...