Xebec Anime
Shaman King Specials
Throughout the broadcast of Shaman King, many shorts (usually referred to as Shaman King omake and TV specials) were made on special days of the year related to spirits and the like. The omake were short stories that were made for humorous effect. Apparently, all of the omake fit into the story before the Shaman Fight 2nd round. Documents of the Shaman Fight was shown with a New Year's omake as well. The TV Specials were aired after specific points of the story as well as on holidays. The specials were never dubbed in English, and, most likely, never will be.
(Source: Wikipedia)
Tales of Eternia THE ANIMATION
In order to prevent the catastrophe called the Grand Fall, Rid Hershel and his companions Farah, Keel and Meredy have obtained the three Greater Spirits ("Craymels" in the game version) of Inferia. En route to Mount Farlos, Rid is kidnapped by the bounty hunter Marone Blucarno, and the party is compelled to head to Belcarnu, an archipelago far from the major cities of Inferia. A series of adventures forces them to remain on the islands, where a more immediate threat to Inferia sleeps.
(Source: Anime News Network)
Zombie-Loan Specials
The series was originally planned to be 20+ episodes but was cut short due to unknown circumstances. These specials released on the 7th DVD volume continue the story.
Uchuu Senkan Yamato 2199 Hoshi-Meguru Hakobune
A new super weapon has emerged and Gamilas ships vanish from the seas. In the meantime, the Yamato has left the Large Magellanic Cloud and is on its way back to the Milky Way Galaxy. During the voyage, the crew is hit by a gatlantean warrior fleet under command of Goran Dagam, who claims the "Yamatee" as his prey. After Susumu Kodai in command refuses to give up the ship, the Yamato makes a run and accidentally ends up inside a strange world that defies logic and the laws of physics. An expedition team is sent to the surface and makes a truly mind-boggling experience that they cannot escape. Next to that, the team doesn't seem to be alone after they encounter their old foes. Time runs out and the Gamilas and Terrons walk a thin line in a world that's not their own, having the Gatlanteans sitting in their necks.
(Source: AnimeNewsNetwork)
Zoids Shin Seiki/Zero
Zoids - powerful animal-shaped combat mechs - are no longer used in warfare, but in organized sporting competitions. The Blitz Team, a group of pilots struggling to carve out a niche for themselves in the Zoid battling leagues, experience a stroke of luck when Bit Cloud, a vagrant junk dealer, wanders into their midst and proves himself capable of piloting the temperamental Liger Zero, a Zoid that refuses to let anyone else into its cockpit. Led by Bit and the Liger, the Blitz Team steadily make their way to the top - but along the way they attract the unwelcome attention of the Backdraft Group, an organization of Zoid pilots that operates outside the laws set down by the Zoid Battle Commission. The Backdraft want powerful Zoids to add to their ranks, and they have their eye on the Liger Zero...
Megami Kouhosei
In the future humankind has expanded and colonized other planets. Then an alien species, Victim, attacks the human colonies leaving only one planet, Zion. In an effort to stop Victim from destroying the last planet a training school, GOA, is set up to gather boys from the Zion colonies and train them to become pilots of the Ingrids AKA The Goddesses, five fighting robots that protect Zion. The boys must possess a rare blood type, EO , as well as a special ability, or EX. Zero (Candidate 88) has just arrived in GOA when he falls into the cockpit of the Ingrid Eeva-Leena. Since the synch between pilot and Ingrid are very sensitive everyone believes the Goddess will kill Zero in an attempt to synch. Just before Zero passes out he makes a full synch with the Goddess. Before he can find out more about the incident, his pilot training begins.
(Source: Anime News Network)
STAR BEAT!: Hoshi no Kodou
Animated music video for STAR BEAT! ~Hoshi no Kodou~, the second single of Bushiroad's BanG Dream! project band Poppin' Party.
Seikimatsu Occult Gakuin Specials
Four short spin-off episodes included in DVD/BD volumes.
Episode 1: よろしくツッチー (Yoroshiku Tsucchi) Vol. 2
Episode 2: なかよしツッチー (Nakayoshi Tsucchi) Vol. 3
Episode 3: がんばれツッチー (Gambare Tsucchi) Vol. 4
Episode 4: さよならツッチー (Sayonara Tsucchi) Vol. 5
(Source: AniList.co)
Hitohira
A transfer student Asai Mugi is a painfully shy girl. She is so shy that she can't speak when she becomes seriously nervous. However, for some reason, she is spotted and recruited as a member of the drama club.
(Source: AnimeNfo)
Yes! BanG_Dream!
Animated music video for Yes! BanG_Dream!, the debut single of Bushiroad's BanG Dream! project band Poppin' Party.
Binzume Yousei
Set in the year 2004, Binzume Yousei is a slice-of-life fairy tale that revolves around four fairies, each represented by four unique colors as seen with their magical bottle jars. These fairies are the extremely peppy Kururu, the reserved and feminine Chiriri, the samurai-loving tomboy Sarara, and the quiet yet quirky Hororo.
Fascinated by the human world, these fairies arrived from the fairy world in hopes of participating in the annual traditions and overall way of human life. However, they have a very limited understanding of the human world. Luckily, they are befriended and guided by two humans—"Sensei-san," a university student who they live with, and a first-grade girl they call "Tama-chan," who is sometimes as naive as the fairies themselves.
Though these bottle fairies have strange ideas and sometimes have difficulty understanding this new world, they try to make the most of the human experience in their own cute little ways.
(Source: MAL Rewrite)
Hashiri Hajimeta bakari no Kimi ni
Animated music video for the third single's title song "Hashiri Hajimeta bakari no Kimi ni" from the band Poppin'Party.
Future Card Buddyfight
An adaptation of the Future Card Buddyfight card game.
Future Card Buddyfight takes place in a more futuristic version of today. The card game connects to a parallel universe through special cards (Buddy Rare Cards) that act as portals. They bring monsters to Earth in order for them to become buddies with humans. Through friendship and courage, they take on and fight challenges, known as Buddyfights, where people of all ages have friendly non-hurtful competitions. The main character, Gaou Mikado has just started Buddyfighting. As the story progresses, Buddyfights are seeming to become a little too real...
Bakusou Kyoudai Let's & Go!!
Based on the manga by Tetsuhiro Koshita, Bakusou Kyoudai Let's & Go!! has two main seasons evolving around the Go brothers and the TRF Victorys. The third season, Bakusou Kyoudai Let's & Go!! MAX evolves more around two new main characters, but the primary idea is the same... Racing!
Let's & Go!! focuses on Retsu and Go Seiba, two young brothers who receive racing cars called "Mini 4WD" by Dr. Tsuchia. From there on, the series portraits those two boys, training and customizing parts to later on participate on Japans Cup, where all of Japan's racers enter to be the best of the best!
(Source: MAL)
Rinne no Lagrange Specials
Rinne no Lagrange short specials included in the Rinne no Lagrange Blu-rays and DVDs.