I turned an unused parking spot near a hospital into steady monthly income by listing it on a peer-to-peer parking marketplace.

Small AI teams ship features faster than their docs. A weekly retainer to keep their docs clean turns into steady freelance income.

A single-purpose SMS reminder tool sold directly to dentists. No sales team, no enterprise pricing — just $49/month and a working product.

Twelve seats, one long table, one fixed menu. Guests pay a flat fee. It covers rent and keeps me cooking.

An idea I keep coming back to: use modern translation tools + human editing to bring forgotten public-domain books to English readers.

Small self-storage facilities sometimes sell individual units. Owning one and renting it produces boring, reliable cash flow.

One page. One skill. Pay-what-you-want with a suggested price. Traffic comes from search and word of mouth.

Estate sales still have amplifiers and turntables sold for pennies. Cleaned, tested and re-listed, they double or triple.

One boring niche, one weekly email. Sponsorships from suppliers cover the bills within a year.

Film photography is back. Point-and-shoots that sold for $8 in 2015 now clear $120 online after a clean and a test roll.

One well-designed intake and session-notes template, sold on Gumroad, quietly earns while you sleep.

Four cars a Saturday, booked a month out. Cash, no employees, no storefront.

Instead of chasing every program on HackerOne, I picked one large target and learned it end-to-end.

Buy underpriced short domains, sit on them, then reach out to funded startups whose brand matches.

A small home booth and a Fiverr Pro profile paid off my mortgage over four years.

Not enough to quit a job, but enough to fund a family vacation each year and be outside a lot.

Zapier, Make and a few custom scripts. Retainers of $1.5-3k/month per firm.

Six regular students, three evenings a week, $70/hour. Pays a mortgage on top of a day job.

Rent long, sublet short (with landlord permission). Modest but real cashflow per unit.

Two Bambu printers running 20 hours a day, packing three afternoons a week.

Rank three plumbers in three cities and never take another cold call.

Contracts, meetings, hard hats, spreadsheets. Boring photos sell every month, forever.

Two calls a month, four posts a week, $2k retainer per client.

Small footprint, cash business, low competition against Coke and Pepsi.