Kahoot is a great platform to make fun, competitve questionnaires. My teachers frequently used it both in secondary school and at UTN and I've made questionnaires myself as projects for different subjects. An activity that could be done with this tool would be a game at the end of the class where students need to fill in the blanks of a few different sentences using vocabulary items learned previously in the lesson.
Canva is a tool I've used to make presentations as a student and I would like to learn to use it further. An activity that could be done with this tool would be to ask students to work on an oral presentation on a topic of their choice including some visual aid with text and pictures.
YouTube is a video-sharing platform that we're all familiar with, and it was very helpful when looking for materials to use with my second-grade students in the practicum. This tool is useful to show students real-life language use in order to elicit from them certain structures that will be later be taught and explained in the lesson.