I started work on https://getcorrello.com (a dashboard for Scrum and Kanban teams using Trello) 2 years ago. It has covered household costs since the middle of last year. I am still a solo founder, looking to grow the business to do more than just cover costs and probably make a hire or two this year.
I've read these posts for a while on HN, it's nice to be able to reply to one finally :)