Multifandom
Archive Of Our Own (AO3)
Large, rapidly growing fiction archive run by the Organization for Transformative Works. Good indexing for microfandoms. Host of the Yuletide exchange since 2009
Audiofic Archive
The main place to find audio readings of fanfiction; sadly dominated by a few fandoms, but there is much to explore
Crack Van
Recommendations live journal community, with at least one recommendation per week in multiple fandoms and some nifty fandom summaries
Fanfic Recs in Every Color of the Rainbow
A community for recommendations site updates, now on dreamwidth (replacement for Te's We Read Crap So You Don't Have To, now sadly defunct) (NEW)
Fanlore
Large fannish directory, with an emphasis on history & sociology of fandom; runs as a wiki
Gensplosion
Dreamwidth community with thoughtful multifandom gen recs (NEW)
Glass Onion
Large multi-fandom archive, with above-average quality
Oblique Publications
Slash fanfiction in several fandoms, mainly older ones; pdf only. Includes large selection of Blake's 7 fiction by M Fae Glasgow & others
Remember Us
Archive of fiction focusing on characters of colour. Over 40 fandoms represented, from Alias to X-Men
Silverlake
Large multi-fandom archive for the Silverlake list, with above-average quality. Includes RPS. An excellent place for small fandoms
Skyehawke
Large semi-selective multi-fandom archive; a particularly good place to find Harry Potter & Good Omens fiction
The Directorium
Fannish directory; runs as a wiki
While We Tell of Yuletide Treasure
Large archive covering a vast number of smaller fandoms, from the Aeneid to Zorro, based on the annual Yuletide exchange 2004–2008
Angel/Buffy
All About Spike
Well-designed, medium-sized selective Spike-centric archive; no longer being updated
Better Buffy Fiction Archive
Medium-sized, searchable, selective archive of some of the fiction recommended by the BBF list. A good place to start
History Lessons
Fiction archive featuring past slayers from the Primal Slayer onwards, maintained by Kate Bolin. Also supplies a list of canon past Slayers, sourced from the show & novels
The Darker Side of Sunnydale
Medium-sized selective archive of non-fluffy BtVS fiction. No longer updating
When the Clock Strikes Challenge
Willow's spell called Slayers all around the world. This intriguing challenge encouraged writers to tell their stories
Blake's 7
Hermit
One-stop shop for all your Blake's 7 needs; includes script transcripts, episode guide, Sevencyclopaedia, printzine listing & an archive of B7 fiction (mainly older stories), the largest on the web again, now that Hip Deep in Heroes is no more
ttba
Online archive for ttba, with fiction by Executrix, Hafren, Ika, Una McCormack & others
Dark is Rising
The Dark is Rising: A Fanfic Writers Guide
Glossary of the Dark is Rising universe
Doctor Who
A Teaspoon And An Open Mind
Large Doctor Who archive, organised by Doctor. Also includes Torchwood and the Sarah Jane Adventures
Firefly
Firefly's Glow Archive
Big non-selective archive for all flavours of Firefly fanfiction
Good Omens
Good Omens Lexicon
Glossary of the Good Omens universe. Includes some fan art
Sherlock Holmes
Camden House
Complete illustrated version of Sherlock Holmes
Sacrilege!
A small archive of Sherlock Holmes slash fiction of above-average quality, plus useful collection of fanfiction links
Sherlockian.Net
Information page, including introductions to the novels/stories by Rosemary Michaud (View Halloa), plus lots of links. A good starting place
The Slasher's Annotated Sherlock Holmes
Communal project to annotate canon. Slash friendly, but not so exclusively so as the title might suggest
Smallville
Smallville Fanfiction Resources
Episode guide, factfile, fiction recommendations & large links list. Good place to start for all things Smallvillean
Star Trek: Deep Space 9
Bajorarama
DS9 fanfiction archive, featuring Nostalgia, Mosca, Tori Morris & others. Small but still active
Trekiverse
Nonselective fiction archive for alt.startrek.creative. It's a bit like Star Trek's answer to ff.net, but unfortunately, I don't know of another large multi-author archive. Also runs the ASC awards
Una McCormack's Deep Space Nine Pages
DS9 fiction by Una McCormack, Henrietta Wotton & Cardie-ologist, Blake's 7 fiction by Una McCormack, plus assorted cult tv links
Tolkien
Anke Eissmann Tolkien illustrations
Large collection of watercolour illustrations by Anke Eissmann, for the Lord of the Rings, Silmarillion & Unfinished Tales. Each thumbnail is set in context with a quotation from the source
Ardalambion
Comprehensive set of articles on Tolkien's invented languages
Encyclopedia of Arda
A very comprehensive Tolkien information site; not all the entries are 100% accurate, but it's a great place to start
Henneth Annun Story Archive (HASA)
Large selective archive of Tolkien fanfiction and poetry (Lord of the Rings, Silmarillion, and other books), including all genres and types. Members also get access to members' unpublished works, as well as useful resources
Jenny Dolfen's Elfwood gallery
Beautiful illustrations from The Silmarillion
John Howe: Illustrator
Gallery of illustrations of The Hobbit, Lord of the Rings, Silmarillion, Unfinished Tales & HoMe by John Howe, one of the best-known illustrators of the books, as well as one of the artists employed in the design of the Peter Jackson films. Many pictures have interesting annotations from the artist, and there's also a search facility
Mithril Awards
Archive for the Mithril Awards for Tolkien fanfiction, poetry & critical essays (2003–4)
Romancing the Jewels
Large archive of Silmarillion fanfiction; index links currently broken: refer to the Fanlore article contents
Silmarillion Writers' Guild
Large non-selective Silmarillion archive; mainly newer authors but some of the classics are archived here. Also runs challenges, including Back to Middle-earth Month
The Trees Remember
Medium-sized selective archive of Mirkwood fanfiction. No longer updating
Tolkien Fan Fiction
Nonselective Tolkien fiction archive & community for the Henneth Annun list; accepts all genres/types
West of the Moon
Selective archive of hobbit fanfiction & poetry
Ursula Le Guin – Earthsea
Earthsea Fanfiction Masterlist
Masterlist of stories & poems in the Earthsea universe
Earthsea Fiction
Community for fanfiction & poetry set in the Earthsea universe; runs occasional challenges & ficathons
The Isolate Tower
An Earthsea compendium: glossary, dictionary & factfiles about Ursula LeGuin's universe
Recommended authors
A Bit of Light
Lord of the Rings fiction & essays by Cara Loup, mainly focusing on Frodo & Sam, including the 'Five Elements' series, plus hobbit-focused links
Alawa's Prose & Poetry
Lord of the Rings fiction & poetry by Alawa, featuring Bilbo, Aragorn, Gilraen & some excellent original characters
Altariel & Isabeau
Tolkien fiction by Altariel & Isabeau, focusing mainly on Gondor & Dol Amroth
Ansereg
Silmarillion & Lord of the Rings adult fiction by Tyellas, focused on the Elves, plus her writings on sex, orcs & Tolkien. Also darkfic recommendations and Silmarillion links list
Arcady's DS9 Fanfiction
DS9 fanfiction with a Garak flavour by Arcady
Blood and Weetabix
Indri's Buffyverse fiction & recommendations
Deborah's Stories
Deborah's Silmarillion, Lord of the Rings & Babylon 5 fanfiction, including 'Father Maglor's Star' & 'Fire and Ice' series, plus art by Elizabeth Wyeth & others. Also Silmarillion & Babylon 5 recommended authors
Dweller in the Underground
Dwimordene's Lord of the Rings fanfiction & poetry, mainly featuring Aragorn, Halbarad & the Steward's family. Includes the 'Best-loved Son' series by Isabeau of Greenlea, Dwimordene & Altariel
Hafren's Gloomy Patch of the Forest
Hafren's Blake's 7 & Hornblower stories
If: Multifandom fanfic by Zara Hemla
Zara Hemla's writings in a whole host of fandoms
Intimations
Fanfiction & vids by Shalott (aka Astolat), in a host of fandoms, small & large
Ithilwen's Silmarillion Fanfiction Page
Silmarillion fanfiction by Ithilwen, including 'The Maedhros Saga', plus some recommended Tolkien links
Palimpsest
Rheanna's fiction: Buffyverse, Doctor Who and others
Penny Dreadful's Online Fanfiction
Blake's 7 fanfiction with just a hint of Travis, plus Buffyverse fic
Speak Again
Fanfiction & poetry by Wild Iris in the Arda- & Jossverses, among others
Stultiloquentia's Foolish Words
Stultiloquentia's poetry & prose in the Joss- & Ardaverses, plus thoughtful recs
Terra Incognita
Fanfiction by Jay Tryfanstone: Harry Potter, Batman & Highlander, plus a diverse range of other fandoms
Yahtzee Genre Edition
Yahtzee's Buffyverse fiction, plus a whole host of other fandoms I never knew she wrote in, including Alias, Harry Potter, Remington Steele, Smallville, Star Trek, Star Wars, Twin Peaks, X-Files, X-Men & others