I definitely wasn't familiar with any of these sites and web-based tools. But then, I don't follow a lot of productivity apps. Someone in the comments provided a list of the apps covered:
1. Witeboard – Drawing
2. Blush – Illustration
3. Carrd – Create one-page sites
4. Whatruns – Discover software used on a website
5. Coverr – Free videos
6. Flourish – Data visualization
7. Untools – Thinking tools and frameworks
8. Lumen5 – Video maker