Rat Creature's Journal

Pass the Pork-Barrel Salt, by Gwendolyn Grace and Etakyma. Gen, Sam Winchester, Dean Winchester, Josh Lyman, Donna Moss, C.J. Cregg. (ca. 5,000 words)
Supernatural/The West Wing
Josh meets the Winchesters during a "Big Block of Cheese Day". This crossover is simply a lot of fun.

Begotten and Gingerbread, by Nilchance. Gen, Alec, Sam Winchester, Dean Winchester, Boby Singer. WIP
Dark Angel/Supernatural
I'm not actually sure whether this is a series or a WIP, but I find it intriguing so far, because in this crossover the timelines of DA and SPN don't seem to have been messed with to mesh them, but instead Alec somehow ended up in 2008, though neither he nor the Winchesters seem to know the how or why yet.

Travelled on his looks, by Petronelle. Gen, Fraser, Ray K., Dick Grayson, Tim Drake. (ca. 2,200 words)
DC Universe/Due South
I'm not much interested in crossdressing, but Fraser and Ray teaming up with the Batclan here was fun.

Untitled, by Tassosss. Gen, Teyla Emmagan, Aeryn Sun. (ca. 2,840 words)
Farscape/Stargate: Atlantis
Teyla and Aeryn team up for a jailbreak, which is simply a great scenario.

Woman Inflammable, by Vehemently. Gen, John Winchester, Sarah Connor. (ca. 4,660 words)
Supernatural/Terminator: The Sarah Connor Chronicles
I really enjoyed this insight into John at the beginning of his hunting life, and the outsider look at Sarah. And of course John would have the worst luck in that that he picks Sarah Connor & Co to run into early on.

where the grass is green and the girls are pretty (ca. 2,165 words) and its sequel oh, won't you please take me home (ca. 2,700 words), by Vorrothiel. Gen, Ash, John Connor.
Supernatural/Terminator
There's something about crossovers between Supernatural and Terminator that really appeals to me. The universes just go together like hazelnuts and chocolate, IMO. Anyway, this one has the unique premise that Ash used to know John Connor in high school.

An Unlikely Meeting, by Cofax. Gen, Sam Winchester, Dean Winchester, Chiana, Rygel, John Crichton. (ca. 1,030 words)
Farscape/Supernatural
This just a snippet, more an opening into a universe than a full story, but what we get is such a cool crossover setup that it's worth pointing out regardless.

Nor Hell A Fury, by Lucy Gillam. Gen, Sam Winchester, Dean Winchester, Dennis Guilder, Christine. (ca. 14,800 words)
Stephen King's Christine/Supernatural
I haven't read Christine, but this was still a very enjoyable casefile type of story with neat twists in the the car's background. So if you like to read about the Winchesters hunting monsters or evil cars in this case, you should give this a try.

Untaken Roads, by Tassos. Gen, Dean Winchester, John Crichton. (ca. 4,500 words)
Farscape/Stargate: Atlantis/Supernatural
This gives us another glimpse at Crichton as Runner, like in the previous FS/SGA crossover by Tassos that I've also recced. And seeing him interact with Dean is just fun.

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Also, I forgot to c&p one of my SGA AU recs in the recs post yesterday, so I decided to tack it onto this one:

Choice of Duty, by Kyrdwyn. Gen, John Sheppard, Radek Zelenka. (ca. 4,680 words)
The premise here is that John is ex-military, and didn't join the Atlantis mission as military, but as a scientist. After Sumner's death, which happens later here than in canon, he's drafted back into active duty by Elizabeth. I'm not sure I see Elizabeth quite this way, but the interaction between John and Radek made this a nice read.

Recs page maintenance is a nightmare these days with all the moving, and worse, f-locking of stories. Just between the last update about a month ago and today several stories have been yanked, actually almost as many as I'm adding in this update. :(

Farscape

Unrealized Peacekeeper, by OneEye. Het, John/Gilina, John/Aeryn. (over 175,000 words) WIP
This AU is inspired by the scene in the Farscape episode Unrealized Reality in which we glimpse the possibility of Crichton as a Peacekeeper captain. It's a very plausible background for how that could have come to pass through just a small change, i.e. what if the wormhole that brought him to the UTs deposited him about ten feet to the right of his original exit point. And this works actually without making Crichton not like himself in any way, nor does the story gloss over the Peacekeeper's ideology and actions we see in canon. Besides it is a great action-adventure that incorporates a lot of elements and events from the episodes.

Stargate: Atlantis

Wild Nest, No Prison (ca. 2,000 words), Sharp and Sided Hail (ca. 2,375 words), and I Am Not the Thing I Was (ca.2,500 words), by Brat Farrar. Gen, John Sheppard. The individual stories are finished, but the universe (with some more bits and fragments already posted here) is still a WIP.
These are set in version of the SGA universe where magic works and is as commonplace as science, and I really enjoy how parts of the larger mythology shine through, but then I adore world-building.

Splinters and Stones, by Kat Reitz and Perryvic. Slash, John Sheppard/Rodney McKay/Carson Beckett, Rodney McKay/Other, John Sheppard/Other. (ca. 100,800 words)
For the purposes of full disclosure, a big part of why I enjoyed this so much is that I have a slavefic and non-con kink, which is also why I liked the CSI story set in this universe by the same authors, which however was more focused on the kink aspects than this one. One of the main points of difference in this AU is that it has some kind of feudalistic structure with an imperial government and feudal houses, and people can be subject to certain kinds of slavery that works like debt bondage or indentured servitude. Anyway, even if you aren't into slavefic in particular, the world-building is very cool, and there is lots of plot and plenty h/c.

Theory of Evolution, by Lavvyan. Slash, John Sheppard/Rodney McKay. (ca. 42,000 words)
It's another Conversion AU in which John's transformation isn't fully reversed. This one is long and has a nice amount of angst. Also, I just have a soft spot for Bug!John in general.

Aegis, by Leah and Springwoof. Slash, John Sheppard/Rodney McKay. (ca. 90,700 words)
The ATA gene in this AU is somewhat more common than in canon and doesn't just enable people to interface with Ancient technology, but gives them special abilities.

Out into the real world, by Mithreon. Slash, John Sheppard/Rodney McKay. (ca. 20,000 words)
It's a fusion of the SGA characters with The Matrix. I didn't quite get all of The Matrix context, because I've only seen the first movie, and I think this takes place in the future after the third or something, but I could follow it well enough.

Five Ways They Weren't Pirates (or: Scenes from Five SGA Pirate AUs), by Sholio. Gen, Het, Slash, team, John Sheppard/Rodney McKay, Rodney McKay/Teyla Emmagan. (ca. 6,000 words)
So I'm not actually all that fond of pirates, and I am a bit frustrated with "five things" stories that kind of tease you with cool AU possibilities, and make you want to learn the whole story behind them, but the snippet is far too short. Still, the scenarios for various kinds of pirates were cool, and made me want to know more, in particular was there no way I could resist a Steampunk AU with them as air pirates.

Mirror Dance, by Trinityofone. Slash, John Sheppard/Rodney McKay. (ca. 45,000 words)
I guess technically this one could count as not-AU because they meet their canon universe counterparts later on in the story through a quantum mirror, so it's more along the line of multiverse fic, but most of this is about an SGA universe in which the gene therapy Rodney underwent had the side effect to transform his body to look like a twin to Sheppard's, and it was a lot of fun to read, with some angst as well.

Supernatural

Clangs, by Vehemently. Gen, Sam Winchester, Dean Winchester. (ca. 14,800 words)
This was a rather creepy and bleak AU. At first I was confused about what exactly was the premise leading into this (which I won't spoil for you), but then when it became clear, it was even more horrible and hopeless than I expected. But it's a really effective, though tragic, "what if" scenario.