I’m not sure what you’re looking for, but here are the crossover fics I remember. Not a lot of writers in the Farscape fandom wrote crossovers, most writers wrote either/or. I hope you find something you like here.
Winter in Shade
Hit the Road (2 fics for the price of one in this challenge)
These last six fics are part of a crossover series, I’ve listed them below first to last.
Glycerine (Scroll down to the second fic in this challenge entry for this fic).
Desperately Wanting
Ordinary World
Love and Memories
Through Glass
How to Save a Life

Enjoy! :)