What FREE business opportunities are vehicles to build residual income best?

Please include links to TRUE FREE opportunities only.
Nothing required to puchase or sell ever.!
I am not looking for a single horse. I am looking for the components to create a financially viable solution.

Companies outsource work these days… check with local businesses. Offer services and keep accounting and payroll records for them on your home computer. Write promotional materials. Learn how to design websites for them.

Also a good Free online book on starting a business, “Go it Alone!” Find it at New Free Books