Ask HN: Examples of company-internal capabilities to become available publicly?

I'm looking for examples of former company-internal capabilities [medium business value but high quality] that later became available as services offered to external parties, thus increasing the company's business value. Amazon offered AWS... but what are other well-known examples?

Things like: Shell to provide _moving_ oil rig services for other petrochemical companies. A company to offer their own security guards providing safety at large sport events. Hotels to provide dry cleaning services to other (possibly competing) hotels and restaurants. A salary-processing dept. of a company to offer payrolling services to companies nearby. [All these are examples I just made up - but I hope the are more in real life.]

Anyway, any case in which a former internal service is turned into a revenue-generating external service, most likely being made possible by a high (technical) quality of that service. I guess it's a likely to be a new service that is orthogonal to the current activities in the company's business model.

Just like in Amazon's case: they offered their excellent infrastructure hosting capabilities to other organizations, in addition to using those just for their own e-commerce needs.