I really wish someone would make a modern scientific calculator - Imagine what would be possible on a modern ARM processor. Even the new HP calculators use old ~70mhz ARM processors emulating the even older saturn HP48 code...
You could build it on top of Android, and have the software be open-source while making money from selling the hardware (so you could run it on a touchscreen, but if you wanted a keyboard you'd buy the calculator).
You could build it on top of Android, and have the software be open-source while making money from selling the hardware (so you could run it on a touchscreen, but if you wanted a keyboard you'd buy the calculator).