Yeah. I have a bunch:
FT gov job - plan to quit next year at age 38, small deferred pension at age 60. My goal this year is to invest 100% of my take-home while I cover costs via:
Air National Guard (weekend warrior) - nets $16-18k and rising, plan to work 39 days a year till 2022, lifetime retired status (cost savings), pension at age 62.
Real estate (Part A): rented out two previous homes, and co-founded a growth-oriented partnership that owns 2 props and is negotiating purchase of several more right now.
Real estate (Part B): had my LLC partners help pay for my real estate license so I could be our agent, and get commission when we buy. May top $10k this year (our 2nd full year). Since I can, I've also offered my services to others, mostly friends and family, and I'll keep doing that (I genuinely like it enough to be a legit post-FIRE job for me).
Rental income is all reinvested so it doesn't offset any current costs, and the LLC won't pay out till well after my target date, but between ANG and RE, I'm still near my crossover point. Once the company starts distributing profits I should be back to a high savings rate in my early 40s (while only working a few days a month) and coasting toward full FIRE.
There's also a lot of stuff I'd like to do after "retirement" that might involve pay - consulting, teaching, policy work, etc.