It's actually in FreeBSD's base, but it's part of the ftp(1) program.

   http://svnweb.freebsd.org/base/vendor/tnftp/dist/src/progressbar.c

   http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-6/src/usr.bin/{Makefile,progress.c}

Not sure if you prefer binary installs or whether you compile your installs yourself... but I'm sure you could get this to compile on FreeBSD with a little work.