Fujifilm X-T3 has a Fujifilm X lens mount and currently there are 88 native lenses available for this mount.
The latest released lenses that are compatible with the X-T3 are the Rokinon 8mm f2.8 Fisheye, the Sigma 23mm F1.4 DC DN C and the Fujifilm XF 8mm F3.5 WR.
Fujifilm X-T3 doesn't have a sensor based image stabilization system but
19 of these lenses already comes with optical image stabilization.
Since Fujifilm X-T3 has a APS-C sensor, it has a focal length multiplier of 1.5x 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 X-T3.
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Fujifilm X-T3 Lenses with Image Stabilization
Fujifilm X-T3 Lenses with Weather Sealings