From Flickr via OSU Open Photo (License)
OSU Open Photo is a fantastic “collection of high quality, openly licensed photos from around the web” put together by Ashley Miller at Ohio State. Images include original sources and licenses. Most of the photos relate to higher education, technology, and people in contemporary educational or work settings. The photos are tagged and searchable. There are also links to other resources for finding free photos. Although there are larger collections out there, this set is useful because it is so nicely curated.