Arrowmatcher is a ballistic application, released under the GPL. It is for Windows, Mac OS and Linux:

Download

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:

• www.texasarchery.org/L1/ArcheryLinks.htm
  big linklist mainly for archers.
• www.loadammo.com/Topics/September01.htm
  description of the ballistic coefficient.
• www.snipercountry.com/ballistics/
  Programs (u.a. smallball) and tables (G1,G2 ..).
• www.smoothey.org/mse.pdf
  very interesting for programmers. (PDF-Document).
• www.nennstiel-ruprecht.de/bullfly/
  external ballistic
• www.arrowinapple.de
  look at "Armbrust-Vergleich" this is a very good comparison of some crossbows. This is a german site, but for the comparison, there is also a english version offered.
• http://linux.softpedia.com/get/Science-and-Engineering/Mathematics/Small-Arms-Ballistics-2908.shtml
  Simple ballistic program for linux. It calculate the trajectory and the Ballistic Coefficient of a bullet. It is possible to switch the Unit System in english or metric system. This is also useable for crossbows.
• http://www.thecrossbowmansden.com/Home.html
  good site about building of crossbows
• www.tap46home.plus.com/mechanics/
  english Website with good infos about wind drift, and much more,
  look at Downloads->Arrow comparison program