The Zaku, "The Father of all Mobile Suits", a title bestowed on to this mobile suit long after its creation & deployment to the battlefield; but this is not the story of the Zaku's exploits during the Zeon War of Independence, later called the One Year War. Neither is it the story of a new type of piloted, independently powered mobile machine. A machine that would be powered by a state of the art thermonuclear reactor, but due to the secrecy and inherent danger involved in developing a project of this kind, its development was outsourced to Hosioka, a small steelworks industrial plant and its employees, this is their story.

From DrCoke at MangaHelpers:

Six years ago, Tsukihiko was caught in an assassination attempt on a little girl, Sami, when he attempted to be her shield. This incident nearly killed him and the girl together, but the little girl was the daughter of an extremely powerful family. With its vast amount of resources, the family was able to keep both Tsukihiko and Sami alive by recreating both of their bodies with cyborg technology. This has forced Sami to permanently rely on wired connection to her life sustaining computer. On the other hand, Tsukihiko has become a cyborg "Knight," sworn to protect Sami from harms way.

Collection of Blame-related short stories: • Zeb-Noid A bloody war that spans millenniums. Two soldiers set out to kill each other. An encounter that could change their two species’ fate forever. • Blame Academy! • Blame Academy! - Tokyo and Nara Under One Umbrella • Blame Academy! - Under the Tower of Blooming Sakura • Parcel • Blame! NSE (NSE: Netsphere Engineer) The much-awaited sequel to BLAME! follows a man, called a Dismantler, who is in charge of sub-dividing the nexus towers that incurr Safeguard interference upon its detection of humans without the net terminal genes. Although humans are once again able to reside in the Net sphere, the Safeguard are still a threat. The Dismantler or NSE, or Net sphere engineer, goes on a journey to aid mankind in their survival. • Pump • Blame!² The protagonist is a descendant of Pcell. This story happens a long time after the events of Blame!. This young silicon creature knows well the havoc that Killy brought and decides to move towards the end of the megastructure, to look for him. • Numa no Kami • Winged Armor Suzumega While it’s not explicitly mentioned in the story, it’s believed that Suzumega is at least somewhat related to Abara since it features the Gaunas. - Kotonoha

Following the Tuatha de Danaan's seajacking incident, things are back to normal at Jindai High School in Tokyo, or as normal as they get with Sousuke guarding Kaname. After finding out who betrayed Mithril and caused the seajacking incident, Kurz and Mao are sent on a top secret mission in order to capture and bring the traitor back.

However, Sousuke and Kaname's lives are about to change when they meet Leonard Testarossa, a high ranking member of a mysterious group named Amalgam. After their meeting, Leonard warns her that he would do anything to recruit her even if it means war in the streets of Tokyo.

From ADV:

Trouble always seems to follow the beautiful and sassy, Kaname Chidori. Though she is only a high-school student, Kaname is constantly the target of terrorism. Lucky for her though, the dreamy Sosuke, an undercover agent from Mithril, is one step behind her, ready to protect her at any cost. But will he be able to save her from harm every time she is in trouble?

Universal Century 0079. The Battle of Solomon rages and Anavel Gato strikes the Earth Federation Forces with terrible force.

Slight retelling of the 2001-2002 Mazinkaiser OVA series. Included in this vokume is a short story called Mazin Kaiser: Shin Majin Densetsu (Mazin Kaiser: Legend of a New Demon God).

A three-man team of Martian-based Coordinators led by Agnes Brahe commands the Acidalium. The trio gets involved in the second EA-ZAFT War as Agnes controls the Voiture Lumiere-based mobile suit known as the GSF-YAM01 Δ Astray.

Hundred - that is the only weapon that can oppose the mysterious life form Savaga visiting the earth. The protagonist, Kirasagi Hayato, aims to become a Martial Arts Master using this Hundred. He managed to get into the battleship university Little Garden. "I wanted to see you, Hayato!" "How do you know my name?"
Around the roommate, Emil Crossford, who somehow knows him well, Hayato gets an uneasy feeling. What’s more, just after the entrance ceremony, he gets asked for a duel by the campus’ strongest martial arts master Queen Claire Harvey.

In the world, the manipulation of tanks (Sensha-do) is one of the traditional martial arts especially for girls. Miho doesn't like Sensha-do and moves to Oarai Girl's High School. But the chairperson of the student council orders Miho to participate in the national Sensha-do championship.

In order to return people that have turned into monsters from the seed of hatred, our hero in mask have sealed his fist… Action mask who also appears in Japan’s national comedy manga "Crayon Shin-chan" is transformed into ultra real and ultra cool character! Go action! His fist will crush the heart of the hatred!

"Long ago there were nine cyborg warriors who came to save humanity whenever the world fell into crisis. These warriors wore red uniforms with yellow scarves and were known as the 00 Cyborgs. Through their efforts, peace was returned to the world, but thereafter their existence slowly faded from human memory. However, time has passed and the world has started to plunge into chaos once more."

An anthology comic of Infinite Stratos by various mangaka.

The 1998 official Xenogears 4koma manga.

In a post-apocalyptic world, a girl leaves her village to find her missing childhood friend, and save her dying world. Her companion in her quest is a machine named "Edison Stein," and he can draw blueprints for magnificent machines. What will await them in "The world outside"?

From Anime News Network:
The story begins in the distant future in the far reaches of the galaxy. The Human Galactic Alliance has been constantly fighting for its survival against a grotesque race of beings called "Hidiaazu." During an intense battle, the young lieutenant Ledo and his humanoid mobile weapon Chamber are swallowed up into a distortion of time and space.
Waking from his artificially induced hibernation, Ledo realizes that he has arrived on Earth, the planet on the lost frontier. On this planet that was completely flooded by the seas, people live in fleets of giant ships, salvaging relics from the seas' depths in order to survive. Ledo arrives on one of the fleets called Gargantia. With no knowledge of the planet's history or culture, he is forced to live alongside Amy, a 15-year-old girl who serves as a messenger aboard the Gargantia fleet. To Ledo, who has lived a life where he knows nothing but fighting, these days of peace continue to surprise him.

The Empire of Britannia invaded Japan using giant robot weapons called Knightmare Frames. Japan was reduced to Area 11, an imperial colony, and its people referred to as the Elevens. At the time, Lelouch, a young Britannian boy exiled to Japan, vowed to his Japanese friend Suzaku that he would destroy Britannia. Years later, Lelouch is a high school student who regularly skips school to play chess and gamble. When he stumbles on a terrorist group of Elevens who are caught by a Britannian task force after stealing a military secret, Lelouch is unexpectedly reunited with Suzaku, who works as a member of the Britannian military. As the rest of the task force arrives, Suzaku is shot for disobeying orders, while the military secret, a young girl, gives Lelouch the power to make anyone obey any order. Taking command of the terrorists, Lelouch adopts the alias "Zero" and begins his rebellion to crush Britannia once and for all. However, his greatest friend soon becomes one of his most troubling enemies when Suzaku becomes the pilot of Britannia's new test model Knightmare, the Lancelot. Note: Storyline is a bit different than the anime.

Short yuri manga, set in a near-futuristic mecha pilot training school.

Half a century ago, the human race was attacked by an enemy from the sea known as the AUS. When Reiji Shiroyama was little, he was unable to protect his sister from the AUS because the gun he tried firing jammed. Since then, Reiji refuses to trust guns and only trusts his fists.

Eraser, the mysterious enemy that invaded Earth 13 years ago!! Before their overwhelming power, the entire Earth neared the verge of collapse. But at the last moment there suddenly appeared Earth's lone savior, The Beast: an ultimate weapon uniquely equipped to counter the Eraser's power!! The Beast is part of the MAGIC Brigade, whose commander-in-chief is also the founder of our Le Prince Academy... Ladies and gentlemen, I present to you, Mr. Vincent!