Wisteria's site can be reached
here including
Current Traffic Conditions As of 5:17 p.m.. Or a more recent version
here. Everything she's written is amazing. I especially loved
Hard Candy which she cowrote with Annie Sewell Jennings.
Speaking of Annie Sewell Jennings, most of her stuff is available through All About Spike, but if it's not there it's
here.
Miranda can be found towards the bottom,
here.. IIRC not everything on that page is Spuffy, but I think most of Miranda's stuff is.
I just posted links yesterday to the
The Bowiehabarata Series on another thread. It's available at AO3 under Rivkat's name as MustangSally is not there yet.
When Miss Murchison took her site down I think she faithfully placed it all up at
Elysian Fields, But in case she didn't here's a
Wayback to her old site.
Here's
Gwytheth Rhys's old fanfic site.
Mr Monkeybottoms' old site.
Helga von Nutwimple, sadly never finished her long fics but they are available here along with several of her short works at
The Crypt (which is different from Crypt of Fic), along with dozens of other authors.
The Crypt, however is Spikecentric but not specifically Spuffy.
Most of Ginmar's stuff is at
All About Spike, but she had some things available on
alanna's (Wisteria's) site as well.
It's not old, but it is only available on LiveJournal so have you Darkapple's
Imitation of a Man? If not I HIGHLY recommend it. It's a sweeping epic and completely amazing.
Pepperlandgirl is another excellent Spuffy writer. She quit to write m/m romance under the name Pepper Espinoza, but her stuff is still accessible on the net. One of the stories listed, Mad World, was rewritten as original fic and I don't think that link still works, but I tested some of the other stories and they do.
There's an excellent "nonfiction" piece that I don't think is still available on the internet so if you'd like to read
Lydia Chalmers' Thesis on Spike (as discussed in Checkpoint. Lydia Chalmers is the name the authors gave to the red haired Watcher with the fascination for Spike in Checkpoint. The thesis became so iconic that I thought for a long while that Lydia Chalmers was the Watcher's name in canon) drop me an IM with your email address and I'll send it.
Kantayra also dropped her site when she stopped writing. A lot of her stuff is available elsewhere but again, I think there's some stories here that she never bothered reposting.