Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons.
Up to EP 10Masuda Kousuke Gekijou: Gag Manga Biyori 3Anime
Up to EP 12Food Wars! The Third Plate: Totsuki Train ArcAnime
Up to EP 26Hell Girl: Three VesselsAnime
Up to EP 2xxxHOLiC ShunmukiAnime
Up to EP 13Panty & Stocking with GarterbeltAnime
Up to EP 26Higurashi: When They CryAnime
Up to EP 1Macross Delta the Movie: Passionate WalkureAnime
Up to EP 1Carnival Phantasm: HibiChika SpecialAnime
Up to EP 12Maria†Holic AliveAnime
Up to EP 12Girl Friend BetaAnime
Up to EP 12No-RinAnime
Up to EP 1Baki: Most Evil Death Row Convicts Special AnimeAnime