Battlestar Galactica/Stargate

Blood Ties/Buffyverse

Buffyverse/Criminal Minds

Buffyverse/Doctor Who

Buffyverse/Harry Potter

Buffyverse/Supernatural

Buffyverse/True Blood

Charmed/Harry Potter

Doctor Who/Fringe

Doctor Who/Primeval

Doctor Who/Stargateverse

Doctor Who/Supernatural

Doctor Who/Veronica Mars

Harry Potter/Percy Jackson & the Olympians

Harry Potter/Twilight

LotS/LotR

multiple crossovers

NCIS/the Dresden Files (booksverse)

One Tree Hill/Supernatural

other crossovers

Supernatural & Veronica Mars