software that is available free of charge; may be distributed for evaluation with a fee requested for additional features or a manual etc, Copyrighted software that is available free of charge on a trial basis, usually with the condition that users pay a fee for continued use and support, computing A type of software that is distributed without payment but is limited in any combination of functionality, availability, or convenience

The capacity of a computer program or application to provide a useful function, capable of serving a purpose well, The ability to perform a task or function; that set of functions that something is able or equipped to perform