Kalkulon is a programmable expression calculator for programmers available for your Windows, Linux and Android device. If you just need a simple calculator Kalkulon is probably not what you are looking for. But if you are looking for a scientific calculator with the following features. C-like syntax, e. G: (0x10>3)+(6|4) 7. Variables, e. G: bitmask = 0x0F0F; 0x1234&bitmask.