x-ballistics is a free online ballistics programm.
Use at your own risk!
All ballistic calculations are public, everyone can see and copy the data and calculations.
Registered user can save your data.
The sourcecode of x-ballistics is under GPLv3.
Some icons used for x-ballistics come from opensuse.
Arrowmatcher is a ballistic application, released under the GPL. It is for Windows, Mac OS and Linux:
This is a simple tool for mainly crossbowarchers. But it can also used for rifles or other bullets. It can calculate the trajectory of arrows and a little bit more.
Everybody are welcome to post comments at the bottom of each page. Simply click the "new comment" link and a window with the uploadform appear.
Ballistic applications and know-how not only for crossbow archers: