The F90x was my first Nikon camera. Even if recently I degraded it to my backup body, I still use it, mainly for black and white stuff (I wasnt't very happy with the color metering for slides).
I wrote a free software running on Linux, as a Photo Secretary replacement for this camera. It's free, you can download it:
It provides some extra features which aren't available in Photo Secretary. The most important is the slide label printing support, which I have been using extensively. It will also display the total number of frames shot, and the number of rolls.