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Portmgr
This page will undergo serious renovations, in the meantime, you can checkout http://www.freebsd.org/portmgr, find a PR to work on, http://www.freebsd.org/cgi/query-pr-summary.cgi?category=ports&severity=&priority=&class=&state=&sort=none&text=&responsible=&multitext=&originator=&release=
Members
portmgr PRs
The PR page gives the list of open PRs.