There is so much Supernatural fanfic that finding the stories you want to read can be a challenge. Rec communities provide recommendations on fan creations -- primarily fiction, but also art and vids. The fans providing the recommendation will usually highlight some features of a story or fanwork that they particularly liked.
Other places which to look for stories are communities that run Fanfic challenges & exchanges, the Supernatural Fic Link Archive or one of the Fan Fic Archives. Character, pairing and genre entries on the Super Wiki also will have links to communities specific to that interest.
Livejournal rec communities
- spnnewsletter has a Rec section collating both community and individual recs each day.
- crack_impala a multimedia rec community covering all genres and pairings.
- sawedoff_recs a multimedia rec community covering all genres and pairings. Ceased posting August 2011, but you can still access all the recs.
- Re(c)-hymenated is a Dean/Castiel rec community, which also features interviews with authors.
- spnroundtable has monthly themed rec posts from guest reccers in addition to sessions where authors and artists talk about their work, as well as chat posts on different topics.
- spn_themes features regular posts focusing on fics connected by a common theme or character eg stories focussing on sport, or college AUs.
- Spn Storyfinders is a comm where people can request recs on a certain theme, or find particular stories. Amazing resource.
- SPN Kink finder - similar to storyfinders, it has a particular focus on stories focussing on sexual kinks and fetishes.
- winabler reccing comm with weekly themes - inactive since 2008
- Rock Salt recs - started in 2012, a rec community covering all genres of Supernatural and RPF fic.
- Crack Van is a multi-fandom rec community, where guests rec fic in their fandom for a month. While Supernatural is featured, reccing has become irregular as fandom-specific communities have grown.
- Sam and Dean entric recs - mainly Wincest but does include Gen.
- SPN Nightcrawler - more a fic link archive than a rec list, but a good place to go to find fic featuring certain types of creatures eg werewolves, vampires etc
- SPN Little bro - a Library of Links and recs for hurt!Sam and hurt!Jared stories
- Supernatural Vid recs is a reccing comm for fanvids.
- SPN Art recs for all forms of Supernatural Art
Tumblr rec communities
- The Art of SPN - Fanart recs from many sites
- Destiel Fanfics A blog dedicated to collecting, reviewing, and organising Destiel fanfiction.
- Destiel fic rec lists organised by genre by destielmybeatingheart
Reddit rec subreddits
- Fandomnatural hosts weekly fanfic recommendation threads, the results of which are posted on the community's tumblr here under the tag "fft" as well as its delicious account here
Fanfiction.net rec communities
- There is a storyfinder type forum on ff.net that you can find here.
- The Supernatural communities contain a number of rec communities covering both general recs or specific themes eg Limp!Sam and angsty Dean stories.
These are themed lists maintained by a single fan which recommends stories. Please feel free to add your own to this list:
- SPN and J2 mpreg rec list by billysgirl5
- Themed J2 AU recs by lexzilla
- Themed J2 Recs by simplybeing
- Big Damn SPN RPS AU List by janissa11
- Supernatural rec list by esolehcar
- Dean/Castiel recs by tracy-loo-who
- Genderswap recs on delicious
- Transgender fics on delicious
- Age regression fic rec list at hoodietime
- Fics based on movies by sarcasticdaisy
- 'Five times' fics by catnthecradle
- Hurt/comfort rec list by calamitycrow
- Dean/Castiel AU rec list by swing-set13
- Mixed rec list by spnreading list on tumblr
- Destiel AU rec list by devoutcastian