This is an impressive list of resources to create things online. The title talk about start-up but honestly if you are just looking for resources to create stuff online this will be helpful at some point!
If you want to create banners quickly with absolutly zero creative knowledge. You can try out https://pablo.buffer.com/. There are a lot less options than on canva.com so it makes it easier to create.
I haven’t tested out but the promise it to help you create UX assets like interview materials, persona, sitemaps etc. Give it a try!
Are you willing to do video reports with your smartphone. The website will give you plenty of informations on where to start and how to do it!