Lord, think a shorter list for me would be of series I like whose characters, items, or concepts haven't shown up in UF. Ironically, most of the series I've gotten into in recent years have been because they first showed up in UF and I went in search of the source material.
If I could name any that I've thought of recently, it might be Walter Bishop (Fringe) working either for the IPO or Tesladyne. Then again, by the 25th century, what would count as "fringe science" would be far different from today.
Though I did once toy with the idea in my head that the Fallout universe would be, within certain limits, what America resembled after the Second Civil War's nuclear exchange.