Kapwing
Life is all about Content Creation these days. At least it is surely a topic your students are passionate about. Kapwing is a tool that your students can use to create their own digital content. Have your students collaborate together to create a video project explaining or showing a concept as a summative project.
Students can make an effective video project up to 4 minutes long with the free account. That is more than enough time for them to demonstrate their knowledge through a project.
There are cool EDU templates available for your students to use which include cool Green Screen options to help them focus their video footage in a fun way. I confirmed that it did let me Green Screen in the free version.
