Hmm, let’s see. I admit to being bad at keeping up with girl-centric fics and fandoms. I'm a slasher through and through, to the detriment of the ladies unfortunately. But I do keep track of communities with the hope that I'll follow them one day.

There's the AO3, most of which also link to a LJ or DW:
Half a Moon
Where No Woman
Femslash Kinkmeme
Fem Gen Ficathon, a large gen ladies collection.
LGBT Fest, All AO3 collections will let you filter by F/F under the Category tags
Queer Characters
Female Focus
There are actually quite a few female or femslash-centric AO3 collections, you just have to look through the Collections page.

And then there's Livejournal:
The Little Bang, a femslash Big Bang
Real Women Fest, a RPS kinkmeme
Passion Perfect, a multifandom community


And some others:
The Porn Battle, which has LJ, DW and AO3 communities.
some Delicious bookmarks by Zvi
My Delicious, which has some extra things I didn't link above.
Female Fest, a DW community centering around women