Built https://www.remotelyawesomejobs.com in my spare time, mostly to prove to myself that I could take something from concept to market. Right now it's "ramen profitable" just with PPC ads, but I hope to add paid job posts so far.
Now that I've done that, I'd like to tackle something bigger. I'd love to create a SaaS that can stand on its own. Still deciding what that will be, though...