Preferred soft phone(s)

Who can tell me what the preferred opensource soft phone is for playing around with asterisk?

I just installed my ultimate hacker’s pbx and cannot wait to get it up-and-running and try it out for myself.

Thanks alot in advance.

A good one is

Thanks for the tip.

I downloaded the tar-file for linux and extracted it. See a bunch of png-files and other stuff, but no clear way to install it.

I am running FreeBSD, so what next?