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 13Hanebado!Anime
Up to EP 25RIN-NEAnime
Up to EP 25Koneko no Chi: Ponponra DairyokouAnime
Up to EP 2Gargantia on the Verdurous Planet: Far Beyond the VoyageAnime
Up to EP 24Gankutsuou: The Count of Monte CristoAnime
Up to EP 3Code:Breaker OVAAnime
Up to EP 13Danganronpa: The AnimationAnime
Up to EP 1ef: A Tale of Memories. - PrologueAnime
Up to EP 1The Wind RisesAnime
Up to EP 12Real GirlAnime
Up to EP 1Final Fantasy VII: Advent ChildrenAnime
Up to EP 25Sakura QuestAnime