Ask HN: Who Wants to Collaborate?

This thread is similar to the monthly "Who is hiring?" and "Freelancer? Seeking freelancer?" threads.

But this one is for people who don't want to work for money and are not looking for people who want to work for money. But for people who want to work together on cool projects.

For free to make the world better or to start a startup.

If you do, please post your project or your skills!

(Inspired by https://news.ycombinator.com/item?id=30162767 )