The present invention extends to methods, systems, and computer program products for discovering, qualifying, and activating software add-in components. An add-in components manager discovers one or more add-in components at the computer system are of a specified type of add-in component requested by an application. The add-in component manager qualifies at least one discovered add-in component based on the at least one discovered add-in component satisfying one or more qualification constraints. The one or more qualification constraints are representative of functionality that is to be associated with an add-in component for the add-in component to interoperate with the application in a desired manner. The add-in component manager activates a qualified add-in component in accordance with the one or more qualification constraints for use with the application.