One wonders what a company like 37 Signals would be classified as. Are they one business model? Cause they certainly have several different successful product

One wonders what a company like 37 Signals would be classified as. Are they one business model? Cause they certainly have several different successful products, although i'd claim that they have a single methodology that's applied all of them (hosted web apps that don't require humans to scale up). Likewise Microsoft... OS manufacturer? Office Suite product company? Video game manufacturer? Web-based something or other?