Many online-platforms for B-Roll popped up in the last years. Also many well known stock photo platforms started to offer video clips.
Some of these platforms even have a selection of free clips, others offer a flatrate subscription.
Free clips
these platform have a small selection of free clips and beyond that are listing clips for purchase.
pixabay.com
videvo.com
pexels.com
Dareful
Videezy
Life of Vids
dissolve.com
Flatrate Subscriptions
Envato Elements and Motionarray are the best bargains right now, offering also sound, music and more. Artgrid.io has high quality clips. Soundstripe started a flatrate stock video archive in 2020, but the selection still is limited. What is your recommendation? Write to contact (at) joopeter.de
https://elements.envato.com
Motionarray.com
http://artgrid.io (High quality)
https://www.soundstripe.com
More Information on the following sites:
https://www.studiobinder.com/
5 Best Free B-Roll Footage Websites
Apps for education (german website)