Third-party
From Styleguide
third-party
When a game developer is not owned in whole or in part by any videogame console manufacturer, it is referred to as a third-party developer. Games developed by third-party developers are third-party games.
Third-party should only be used as an adjective, and never as a noun. Electronic Arts is a third-party developer. NOT: Electronic Arts is a third party.
Example: Third-party support was the key to the PlayStation’s success.
Wrong: 3rd party, thirdparty, third party, Third-Party.
Also see: developer, first-party, publisher, second-party.
