For those of us interested in ponyfic, Fimfiction is generally where it's at. It's by far the largest archive of MLP fanfiction, it has a mostly pleasant and easy to use interface, it's vastly nicer to look at than the ugly Archive of Our Own and the "it's still 1999, right?" fanfiction.net – and, bluntly, Fimf has eBay Syndrome in that it's where everyone goes, so it's where everything gets published, so it's where everyone goes, so...
But it's not the only place. I recently discovered Offprint. This site's front page will look strangely familiar to everyone familiar with Fimfiction – which is probably all of you. Indeed, although it's currently a relatively tiny site, MLP:FiM is by some distance the most-used fanwork tag. I say "fanwork" because Offprint hosts not only multiple fandoms' fics but original fiction as well, something unusual for a fic archive.
Navigation is clunky compared with Fimfiction – for example, while clicking a title card's MLP:FiM button filters the display to only ponyfic, clicking a genre tag makes the button move but does precisely nothing. I can't filter to just original fics, either. There doesn't seem to be any way to download fics as EPUB (a near-dealbreaker for me). What's been implemented works, but Offprint is officially still in alpha (after two years...) and it feels like it, too.
Looking at the Pony section, there are a few names I immediately recognise: Admiral Biscuit, iisaw, bats, Mockingbirb. Not enough really to appeal, though: for all its ugliness, I'd rather use AO3 to access the Alicorn Adventures now they've (mostly) left Fimfic, since AO3 does allow you to download as EPUB. [Does that mean you'll get around to On the Rocks this side of the heat death of the universe, then? —Ed.]
And now I get to one thing I thoroughly approve of. As regular readers of this blog will know, I despise foalcon. Fimfiction's continued refusal to provide even a filter for that stuff, despite having a bunch of filters for narcotics, profanity and so on, is pathetic. Offprint bans foalcon outright, together with its equivalents in other fandoms and original fiction. Ten billion points for that, Offprint.
That point notwithstanding, I don't expect to spend any significant time reading on Offprint, certainly not until and unless it advances considerably from its current state. However, it's probably worth reminding everyone at this point that, although Ponyfic Roundup overwhelmingly features stories from Fimfiction, that is not a requirement. If you see something great on Offprint that isn't available on Fimf, by all means recommend it!