I made Nomad List (https://nomadlist.com), which lets you find the best places to live and work. It's a mix between a cost of living index and a community for digital nomads, remote workers and general (modern) travelers.
I've built it by myself and I think it gives me a big advantage. I see a lot of people partnering with co-founders, and then they have to discuss every little new feature. And ego gets involved. And meetings.
I just have a meeting in my head before I sleep every night with what I'm going to make the next day. It means I ship faster.
My motivation was that I wanted to find places that would be suitable for me to travel to and work, but I didn't want to browse countless of blogs to figure out.
I thought approachign it from a data perspective would be easier. The data will always be subjective and never completely accurate, but it can give people an idea.
It now seems like the sites inspires people too to start traveling, when they see all the options. That I never expected.