Your options always depend on what you want to do.
If you want to help the Open Directory, there are some options (suggesting sites, reporting bad links, volunteering to be an editor.)
If that's not your purpose, than ... dmoz.org doesn't offer any tools, and you should look at some of the umpteen million other sites on the net, that might offer such tools.
Those are the same options an editor has: spend time at dmoz.org building the directory, or spend time at some other website, working on some other goal.