BallCalc 

What is BallCalc

BallCalc is a ballistics calculator
for Windows Mobile and other 
mobile devices
Info 
 Lead Developer : Austin Schibler, Joshua Impson.

 Windows Mobile - 
 Latest release: Version 1.8 Beta
 Licensed: GNU General Public License
 Operating System: Windows Mobile Professional
 Language: C++

 Windows Mobile Non-Touch Screen - 
 Latest release: Version 1.1 Beta
 Licenced: GNU General Public License
 Operating System: Windows Mobile Standard
 Language: C++

 Android - 
 Latest release: Version 1.0 Beta
 Liscenced: GNU General Public License
 Operating System: Android
 Language: Jave
 
Download
You can download BallCalc here.