Panasonic GX8 has a Micro Four Thirds lens mount and currently there are 105 native lenses available for this mount.
GX8 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on GX8.
Since Panasonic GX8 has a Four Thirds sensor, it has a focal length multiplier of 2� so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on GX8.
You may also also be interested in these:
Panasonic GX8 Lenses with Image Stabilization
Panasonic GX8 Lenses with Weather Sealings