Heres a link to one of my most favorite Ranma SailorMoon crossovers, Lines of Destiny. Many other fics are showcased here as well. All are written by Louis Phillipe Giroux who is also the maintainer for the site.

Here you'll find the Tenchi/Ranma crossover, Tenchi and Ranma: Together Forever? It's a really great fic and well worth reading by anyone who is a fan to the series'

Here's a link to a Nabiki and Ranma archive where my fic Treasure Hunter was first posted! It's site maintainer is Bill Hitchens and a good place to look for Ranma fanfiction especially ones involving Ranma and Nabiki together in one fashoin or another.

Heres a guy who doesn't know what sleep is! Ryoga P Hibiki A.K.A Carrot Glace has numerous fanfictions to his name. In fact it would probably take you more than a month to read through all the fictions he's posted to this site, and it's not even up to date. Only drawback is Ryoga seems to never get around to finishing his fics.