shareware

/ˈʃɛrˌwɛr/
noun
  1. Software that is distributed for free on a trial basis, with the expectation that users will pay for it if they continue to use it.
    • I downloaded a shareware game that lets me play for 30 days before I have to buy it.
    • Many small developers release their programs as shareware to reach a wider audience.
    • The shareware version had limited features, but the full version was available for a small fee.