Bullet Group Analysis Software

[Hinnerk]

Not directly a reloading topic but I assume that if one is reloading they probably care about target stats ....

What software do you use to do bullet group analysis or do you do it by hand? I have tried On Target software (http://www.ontargetshooting.com/) and find it useful but am looking for something to run on Linux. Is there anything out there?

[croue]

The caldwell chronograph app measures groups as well. You have to tell it what 1" is (use target with 1" squares to make it easy) and pick the bullet holes by finger. But it's very easy and the price is right - free!