Use your Nikon on your Leica rangefinder camera.
Use M42 lenses on your Fuji X Pro
Use Pentax-K lenses on your Nikon camera
Use Leica-M lenses on your Fuji-X camera
Use 4/3 lenses on your (olympus, panasonic) micro 4/3 cameras (Silver version)
Use Leica-R lenses on your Leica-M camera
Use Canon FD lenses on your E-mount camera. Economic version without tripod anchor.
Economic adapter to use Leica thread rangefinder lens on Sony E-mount camera
Use Hasselblad-C lenses on your Canon EOS camera