Fujifilm got into the mirrorless world with the XPro-1, introduced in early 2012. This came after a long pause in availability of interchangeable lens cameras from Fujifilm (they made Nikon F-mount DSLRs in the 90’s and early 00’s). With two model line exceptions (i.e.. the X-A# series and the medium format GFX), the Fujifilm X mirrorless cameras all use a unique sensor color filtration called X-Trans (as compared to Bayer, the usual filtration orientation).
The GFX line of medium format mirrorless cameras was announced at Photokina 2016 with the initial 50S model.
Data pages for all the Fujifilm mirrorless cameras:
Available Fujifilm X-mount lenses