Pexels Videos provides high quality and completely free stock Videos licensed under the Pexels license. All videos are nicely tagged, searchable and also easy to discover through their discover pages.
Coverr offers free high quality videos for designers and developers. You can browse their wide collection of videos like tech, aerial and nature.
Mixkit offers extraordinary free HD stock video footage. All their videos are searchable and categorized for easy access and use.
Vidsplay offers free stock video footage in high definition. You are granted non-exclusive rights to use and download their video material.