An alternate Mazinger Z manga by OUTA Gosaku. Not to be confused with the version by NAGAI Go. It follows the anime timeline of events.

Futura, the land of Techs. Futurans are ranked according to a class structure, and Tek No is a 15 year-old NoTech at the very bottom -- he isn't allowed to use Techs. In order to protect the family he loves, and the change Futura for the better, Tek and his orphanage brothers Hope and Crash aim to join the Royal Guard, the military force of Futura. The road ahead is steep and harsh, and they must complete missions, raise their ranks, and one day truly change the country. You can read two early chapters now! Check patreon.com/blumanga

The manga depicts the past of Ishiro Meita, a freelance spy who graduated from a spy training school with top grades. When he's asked to investigate an unknown object that crashed from space, his life takes a drastic turn when he meets Taiya Hando. (from RangerWiki)

Updating

Robotic armed freedom fighters fight for Earth's future in this intergalactic tale of the pursuit of freedom. After Earth's overpopulation sends humans offworld to live in space stations, they are abused by the controlling power—the Earth Federation government. Colonists form the Zeon Dukedom to resolve their disputes and wage the One Year War for independence. For over 20 years, the world of Gundam has reigned over all other mecha anime and manga series. Mobile Suit Gundam: Blue Destiny continues the Gundam legacy with the adventures of Federal Forces second lieutenant Yu Kajima and his special unit of mobile suits.

Frederick F. Brown is a mobile suit trainee in one of Zeon's schools, but always had a hard time keeping up with everyone. Ten months after training hard, he's thrust into actual combat for the first time together with Zeon's declaration of war. He becomes witness to the horrors and atrocities associated with war first hand as he fights to stay alive.

A Steampunk mystery from the creator of Silent Mobius! In this tale of a past (or future?) that never was, in the age of Steam, masked dandies, dastardly supervillains, and sentient machines stalk a Japanese Gotham by night. Are the sharp wits and quick reflexes of wunderkind detectives Narutaki and pretty nurse Ling Ling enough to thwart evil and unravel the mysteries of this strange world? All steamed up…. When Narutaki meets Ling Ling, a pretty nurse with a dark secret, he gains both a true-blu friend and two new assistants. He'll certainly need all the help he can get when he is forced to do battle with such nefarious villains as the Phantom Knight, the Machine Baron, and Dr. Guilty! The series original run was 8 volumes. After which it got 5 more with title change. All 13 volumes were collected under "true steam detectives"

The story is set on U.C. 0089 after the First Neo Zeon War, and will center on Jorn, an A.E.U.G. pilot who fought the Titans during the Gryps Conflict. The story will feature the appearance of such mobile suits as the AMX-003 Gaza, MS-14J ReGelgu, RMS-106 Hizack, and RMS-108 Marasai.

The story revolves around Taira Yunokami a boy in fifth grade that helps his father run a food truck. One day, he meets a famished girl in a park on his way to school. After helping the girl, the city is suddenly attacked by Glutton, an inter-dimensional threat that endangers the world. Amidst the chaos Sworg, a young member of the Space Administration Bureau Braver saves both Taira and the girl. Sworg has come to Earth to pursue the enigmatic and malevolent Glutton. When fate brings Sworg and Taira together, they'll find themselves unexpectedly thrust into an extraordinary journey through multiple dimensions.

Han Yisu’s proud of himself for winning over Kang Jihyung, the perfect partner. Not only is Jihyung incredibly rich and handsome, he’s also turned gay just for Yisu and Yisu alone. For Jihyung, Yisu’s willing to move in with Kang Jungman, Jihyung’s father and president of Cheonbong Corporations, and be the daughter-in-law that Jungman so seems to want. So just imagine his surprise when Jihyung suddenly brings home a woman and declares her his fiancee. And not just any woman, but Jungman’s mistress from his favorite bar. Enraged, Jungman chases his own son out of his home and vows to cut him off. Meanwhile Yisu, heartbroken and confused, wants to move out, but Jungman insists that Yisu needs to “take my son’s place.” Yisu’s always considered himself tough, but all this family drama is too much even for him… Just what is he to the house of Kang? Son-in-law, daughter-in-law, stepson, or maybe…all of the above? Han Yisu, is the gay "daughter-in-law" of a chaebol family where he endured all kinds of humiliations, all for his Kang Ji-hyung, who he fell in love with at first sight. When his trusted husband ran away for having an affair, He started a dangerous and forced cohabitation with Kang Joong-man, his bad-tempered father-in-law. A story about a gay man in a corner who wanders between an old dog and a young dog biting both of them. A sitcom filled with Yisu's wavering love and hatred between the two filthy rich men.

The story takes place on Earth nearly a thousand years in the future. After a devastating war between artificial intelligence and humanity, monstrous creatures known as "Tai Sui" roam the land, drastically altering the natural environment and social order. In response, humanity developed "BOX"a series of advanced technologies related to mysterious boxes. These "Beast Boxes" became humanity's key allies in the fierce resistance against their enemies.Elites capable of "resonating" with their Beast Box partners are known as "Beast Box Masters." Among them, a once-overlooked Beast Box Master named Liu Ma is unexpectedly chosen by a small dinosaur-like Beast Box named "Dio." Together, they begin their mission to protect the city-state. During grueling training, Liu Ma meets several other Beast Box Masters and their Beast Box companions. The group is soon tasked with reinforcing "Vermilion City," marking the beginning of their epic journey.

In UC0095, following the events of Char's Counterattack, Kikka Kobayashi gathers testimonies about Amuro Ray to show the world the kind of person he was.

A manga adaptation of the first Medarot game. Created by Horuma Rin, the artist for the game series. The story follows Hikaru Agata and his medarot, Metabee's adventures.

The legendary hero left behind by the eternal master is back! Mitsuko visits a Western-style house in search of her father and finds Android Jirou!　Kikaider fights fiercely against Green Mantis, Gray Cyborg, and Orange Ant!

Supersonic Fingers is the first Gunnm Gaiden story, it takes place shortly after Gally's fight with Jashugan. Gally is attacked by an unknown sniper, and while she recouperates, her hunter-warrior friends search for the culprit. The culprit is a strong fighter with a death wish that only Gally can fufill. The Holy Knight is the second Gunnm Gaiden story, Homecoming is the third, but takes places immediately before The Holy Knight. Before he met Gally, Ido worked as a hunter-warrior to make ends meet. Although a skilled doctor, he had no skill in the areas of cybernetics. He saves and befriends a young, mysterious girl, whom he names Carol. During their time together Ido learns the art of cyber-medicine, and starts his cyber-doc practice, but Carol's past catches up with her and Ido learns a painful lesson about medicine(https://kodansha.us/series/battle-angel-alita-holy-night/)

There is only one Magi Craft Meister in the world. After the death of the last Meister over one thousand years ago, Jin Nidou was transported to another world in order to succeed her will.After obtaining the knowledge of the Magi Craft Meister, Jin attempts to use a warp gate but it malfunctions, transporting him to an unknown place. Along with that, an automata he recently restored also uses the warp gate in order to search for her “father”. Thus, the crafting journey of the new Magi Craft Meister begins!

(from ebookjapan): Kazuo Umezu's "Ultraman" was serialized at the same time as the 1966 TV broadcast!　The fierce battles with popular monsters such as the Baltan and Mefilas aliens are fully recorded along with the color pages from the serialization and the chapter covers! Kazuo Umezu's very famous manga adaptation of the first Ultraman series.

A tie in to the Shinkalion: Change the World anime.

U.C. 0097, one year after the opening of "Laplace's Box". Despite the revelation of the Universal Century Charter that acknowledges the existence and rights of Newtypes, the framework of the world has not been greatly altered. The conflict later dubbed the "Laplace Incident" is thought to have ended with the downfall of the Neo Zeon remnants known as the Sleeves. In its final battle, two full psycho-frame mobile suits displayed power beyond human understanding. The white unicorn and the black lion were sealed away to remove this danger from people's consciousness, and they should now be completely forgotten. However, the RX-0 Unicorn Gundam 03, which disappeared two years earlier, is now about to show itself in the Earth Sphere once more. A golden phoenix… named Phenex.

This saga found its home in the pages of Gundam Ace starting in 2010. It stands as the long-awaited sequel to Revival of Zeon, a work that first graced bookshelves as a self-contained volume back in 1988.

This work is depicted as an "if story" (alternative storyline) of the main Zeta Gundam series. Char Aznable, a captain in the Principality of Zeon, was forced to assist and join the Titans after the One Year War when his sister Artesia was taken hostage by them. His main mission was to hunt down the remnants of Zeon.

The "Noisy Fairy Squadron, a secret unit under the direct control of Kycilia Zabi of the Principality of Zeon, is deployed somewhere in the North American continent. With only female members, they fight in the One Year War against the Earth Federation Forces. They are forced to face the unreasonableness of war and the bonds with their comrades...

(from ebookjapan): Fourteen years ago, Natsuko lost her father in an accident, and she was the queen of the crystal world, Oxtan Ryunka!　 Seven Bridge, a group of seven mechanical creatures, not fairies, stand up to the threat of Cunningham, a rabbit-faced man, Bookman, a splitting man, and the Nuclear King, who aims for supremacy over all the worlds. Now, let's go on an adventure through seven parallel worlds!　 A full-length SF adventure by the genius of the Japanese SF world, Shuho Itabashi!

Golden Warrior Iczer-One (Part One) takes place 10 years before the Fight! Iczer-1 anime. It's the story of how Iczer-One is awakened and escapes the Cthulhu spaceship just before it is taken over by Big Gold. Iczer-One crashes down on the planet Ishua with no memories and no knowledge about herself or her past. There, she is forced to fight against Magenta, one of the Cthulhu's commanders who is in charge of the Cthulhu's invasion force on this world. "Part two" was never writen. Not to be confused with (https://mangadex.org/title/b1a3191a-ac14-484e-af3c-3bbbfed28e98/legend-of-Iczer)