Duke Nukem 3D
Duke Caribbean: Life's a Beach: This is an add-on created by Sunstorm Interactive. Duke relaxes on a tropical island when he discovers that the aliens are having their own "vacation" there. This unofficial add-on has a sunny Caribbean atmosphere, nice beaches and hotels as well as some of the original Duke Nukem 3D stuff fit in.  It includes levels created by Charlie Wiederhold, who later worked for 3D Realms to work on Duke Nukem Forever, the upcoming sequel to Duke Nukem 3D.