Fujifilm GFX 100S has a Fujifilm G lens mount and currently there are 23 native lenses available for this mount.
The latest released lenses that are compatible with the GFX 100S are the TTArtisan 17mm F4 TS, the Laowa 55mm F2.8 TS and the Laowa 100mm F2.8 TS.
GFX 100S also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on the GFX 100S.
Since Fujifilm GFX 100S has a Medium format sensor, it has a focal length multiplier of 0.79x 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 GFX 100S.
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Fujifilm GFX 100S Lenses with Image Stabilization
Fujifilm GFX 100S Lenses with Weather Sealings