inteliCalc 1.0
This is a scientific calculator which uses RPN which is typical for a scientific calculator and supports a permanent, unlimited in depth stack.
SunPos 03.01.98
Calculates the sun's position given the time and location on earth. Includes a 3D shadow view that can be rotated and scaled for better viewing.
Calc++ and MiniCalc++ 4.8
These very fast CASIO style scientific calculators also have: 18 scientific constants. Includes speed of light, Plancks, Boltzmann, etc.