cttop is a top-like program that shows netfilter connection tracking entries.
entries can be sorted by various criteria and grouped e.g. by source ip.
cttop requires libnetfilter_conntrack and glib.
Latest release is
cttop-0.3.tar.bz2 (gpg signature)

The latest development version can be obtained using git:
git clone git://git.breakpoint.cc/fw/cttop.git (gitweb)

You can report bugs to fw-cttop @ strlen.de.