"CDC–TV is an online video resource available through CDC.gov. CDC-TV videos cover a variety of health, safety and preparedness topics as part of CDC′s goal of achieving true improvements in people′s lives by accelerating health impact and reducing health disparities."
"This library contains digital movies uploaded by Archive users which range from classic full-length films, to daily alternative news broadcasts, to cartoons and concerts. Many of these videos are available for free download."
Search Vimeo for videos with Creative Commons licensing.
There are also many sites that offer video for free viewing and streaming. These videos are often copyrighted, but may be used for teaching following fair use guidelines. The links below are to guides to these other video sources.