TAGX is a free online tool that allows you to highlight and annotate videos from sources such as YouTube, Vimeo, or other videos available online.
Once you’ve entered the link to a video, you can play through the video, adding your own commentary, highlights or tags.
This is a great way to offer more explanation for a video to your students. Once you are finished, you can share the highlights with an URL. Here’s a sample from the September 2019 Apple Event.
The site is free to use and doesn’t require any registration or signup.