While it's not proving the majority of my income, I've been growing BannerJS for a couple of months from a side project for some of my own sites into some nice income on the side.
For remote workers in the Bay Area that deal with the added loneliness of working from home, Out Of Office[0] hosts weekly popup coworking sessions at different locations around San Francisco. It's a great way to get out of the house and meet other people while getting your work done.
https://bannerjs.com