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 26Bamboo BladeAnime
Up to EP 12CaligulaAnime
Up to EP 26Hell Girl: Two MirrorsAnime
Up to EP 1xxxHOLiC Movie: Manatsu no Yoru no YumeAnime
Up to EP 13The Eccentric FamilyAnime
Up to EP 12MEKAKUCITY ACTORSAnime
Up to EP 1Macross Frontier: The Wings of FarewellAnime
Up to EP 1Carnival Phantasm: Illya-jouAnime
Up to EP 12Maria†HolicAnime
Up to EP 4Genshiken Nidaime SpecialsAnime
Up to EP 12RobiHachiAnime
Up to EP 24Baki the Grappler: Saidai Tournament-henAnime