Neko is a fantastic project, I love telling people about it. It does so much more then the title says :)
Being able to watch videos with someone in perfect sync is a great experience. It's not the same to just sync two video elements, but you actually can scroll the page and feels like you are sharing the same screen.
This and https://github.com/giongto35/cloud-morph I think have the chance to really inspire/change the next generation of products that get built in the space.