Community video
Largely US video content available under variety of creative commons licenses.
Hubble video
Movies about Hubble telescope and space discoveries.
Internet Archive
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.
Internet Archive Stock Footage
US database of content, some public domain, others check terms of use. NOTE: Even where footage is public domain, music in background may not be.
Mazwai
Download free creative commons HD video clips & footages. (Creative Commons Zero License)
Open Images
Audiovisual material from the EU, especially the Netherlands.
Pexels Stock Video Footage
Short selections of stock video footage hosted on Vimeo, free for any use including commercial. Links to paid content.
PhET: Free online physics, biology, earth sciences, maths simulations (Creative Commons Attribution license (CC-BY)
University of Colorado Boulder interactive simulation generator. The website states: PhET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery.
Pixabay(Pixabay licence terms allow no attribution and unlimited non-commercial and commercial use, except for sale or distribution of Videos as stock videos for resale). Choose "videos" rather than images.
Public Domain Videos in HD on Vimeo
The idea of this channel is to create a completely free library of HD footage that can be used by anyone for anything.
Ted Talks
TED talks cover all subject areas and are licensed under Creative Commons license (CC BY -- NC -- ND 4.0 International) unless otherwise stated. Using a TED Talk in a commercial context (eg at a company event, in training materials, within a TED-branded video offering or editorial program) requires you fill out their media licensing request form.
Videvo
Some videos for reuse mixed with Shutterstock paid content and "premium' paid content. Avoid all videos marked 'premium' or with Shutterstock watermarks. 'Free' videos should be fine. More information on the licence is available.
Wikimedia Commons
A database of 33,463,510 freely usable media files to which anyone can contribute.