1)   Federation Screen Saver 1.1
Federation Screen Saver is a Freeware Mac OS X screen saver featuring a 360 degree rotating logo of the United Federation of Planets from Star Trek The Next Generation and Star Trek Deep Space Nine.
Federation, Trekkie, Klingon, Vulcan, Starfleet, Sci-Fi, Science, Space,

 2)   Klingon Screen Saver 1.0
Klingon Screen Saver is a Freeware Mac OS X screen saver featuring a 360 degree rotating logo of the Klingon Empire from Star Trek.
Klingon, Trekkie, Federation, Vulcan, Starfleet, Sci-Fi, Science, Space,

 3)   StarFleet Medical Screen Saver 1.0
StarFleet Medical Facility Screen Saver is a Freeware Mac OS X screen saver featuring a 360 degree rotating logo of a StarFleet Medical Facility.
Starfleet, Trekkie, Federation, Klingon, Vulcan, Sci-Fi, Science, Space, Medical,