To be technically correct, The Open Directory Project (DMOZ.org, formerly NewHoo) is a search “directory”, not a search “engine”.
This means: the content at DMOZ.org is hand-picked by human editors, not by robot programs.
Sponsored by Netscape, and employing 50,000 volunteer experts as editors, the ODP (DMOZ.org) has about 4 million links in its database. Although less than 1% the size of Google, DMOZ.org is packed with helpful hand-picked Internet links that have been filtered by human judgment.
PROS: DMOZ content is hand-picked by subject matter experts; irrelevant content is usually filtered out well.
CONS: Content quality varies with the quality of volunteerism, slow to update, ranking is inconsistent, not good for news or current events content.