Important: Before use, double check the license!
Check the applicable license terms of every single video (especially if your purpose is commercial) to ensure you have the necessary permissions.
Can be used for non-commercial purposes and must credit Centre for Instructional Technology.
License information available on homepage here https://cit.nus.edu.sg/projects/nus-drone-footages/
Pexels is a free stock photo and video website with 4k or HD videos. It helps everyone who is looking for visuals to find great photos and videos that can be downloaded and used for free. If you see a photo or video you like, simply download it for free (no strings attached!). (Source)
Videvo offers stock videos and motion graphics for use. Video clips that carry the Creative Commons 3.0 license must be attributed to the original author. (source) There is no standard license that applies to all videos. Check each video for the license terms.
All Videos published on Coverr.co can be used for free. You can use them for commercial and noncommercial purposes. (source)
Youtube allows creators to mark their videos with a Creative Commons Attribution license (CC-BY).
Steps to locate CC-BY videos on YouTube.
Step 1: Search for your keyword in the Youtube search bar
Step 2: At the results pages, click Filter > Creative Commons
Step 3: The results shown will be filtered down to those marked CC-BY by the creator
For more free stock video websites, please take a look at the link above.