Description:
SpaceTime 4.0 is the most powerful mathematics program ever developed for Windows Mobile powered devices.
Move, zoom and rotate 2D, 3D and time graphs in real-time. Explore mathematical concepts in an innovative interface and write your own scripts in our powerful programming language.
Solve limits, derivatives and integrals with MobileCAS® our powerful computer algebra system with typesetting.
Screenshots:

More screenshots here.
Note:
The Windows Mobile version of SpaceTime has been discontinued and is now free to register!
When prompted to register, click the Register button to register for free. You must have an active internet connection on your device. If a message box appears saying, "The page you are looking for cannot be found" make sure you are using Internet Explorer on your device.