↑World Wind (see ↵world wind works) was released by NASA as Open Source Software, and quite naturally a ↑world wind community emerged, generating add-ons. See ↑The unofficial unofficial add-ons list, which includes download-links. There is much which can be put to good use, and things beyond. For example the ↑WorldWind 1.3 Deathstar addon—like Skall, the creator, said: “Useless, but somebody had to do it !” That’s absolutely right.