Rygart Arrow is the only one in his world who lacks the inherent ability to power up quartz, the energy source that makes all of the machines run. Nevertheless, he's pretty well connected. The King and Queen of his country of Krisna happen to be old college friends. But so is Zess, the guy who is leading the army of a neighboring kingdom in an attack on Krisna.
How did it comes to this? There's little time to ponder the implications as an army in giant, mechanized battle suits attacks. Arrow just feels like he's in the way - until he comes across a powerful, ancient mech that no one has yet to be able to figure out how to run. But his natural affinity for the suit's operating mechanism may just turn Arrow into the most important player of all.

After regaining consciousness, your average high-schooler Asagaya Shin has become an AI for a space battleship. As if that wasn’t enough, the ship has been surrounded by enemies, and he himself has a damaged engine, putting him in a dire situation.

The warship commander had already died in combat, and taking the place of the temporary commander is a young girl of the imperial family, who had joined the ship out of courtesy. Shin had tried convincing himself that this was a dream, but being persuaded by the girl, he stands as a battleship.

After somehow crushing the enemy at point-blank range, the fleet’s fight is over, and the battle for the fate of the empire has ended in a crushing defeat. Shin gathers up the survivors and plans to escape the battleground, but there’s a large enemy fleet on the route to the empire. He makes a jump deep into the enemy territory on a slim chance, but —

Set 10,000 years in the future, a young boy has been turned into an incredibly powerful cheat AI and leads a small fleet to become peerless. There’s romantic comedy, imperial intrigue, ancient weapons, philosophy, and more!

Based on the TV Series of the same name, insects all over the world begin to swarm for unknown reasons, with other animals and plants acting strange as well. To investigate this, Takuya Kai is dispatched with an Earth Academia group. Investigating independently, Takuya finds Guru who reveals that insects are preparing for battle against invaders from another dimension. Offering their aid, the Earth Academia create suits of armor to combat the threat as the Jamahl arrive to Earth to enslave humans. Though they have trouble perfecting the Bio-Machinery, Guru arrives to infuse the armor with the life force of many insects. Once the suits become the B-Commanders, one suit chooses Takuya while the other two bond to Daisaku Katagiri and Rei Hayama. With their newfound power, the B-Fighters fight to drive back Jamahl's forces. (Wikipedia)

This series is the reboot to the original Weekly Shonen Jump series Juuki Ningen Jumbor (Jumbor Barutronica). This manga takes place in an alternate universe from the original story, but features many of the same characters.

Baru Craw died during the start of Genber's World Construction Project. However, he wakes up 10 years later as a jumbor.

MIKAMI Hiromasa is the story writer for the series. His name can also be credited as MIUE Yuma.

Set in a part of Tokyo that has descended into a quagmire, the story follows Unit 8 of the 5th Special Public Security Section's 3rd Mobile Assault Division, popularly called "The Eighth," who don powered armor "Willwear" exoskeletons to counter the rise in crime.

Assistant inspector Asami Kazari is assigned to The Eighth with the task of assessing the unit's status and reporting it to her superiors. But her true goal is to rehabilitate this sloppy, haphazard, justice-less group.

Spin-off Comic from "The World of Otome Games is Tough for Mobs" Starts! A kindergartener mob life comedy! Even when they're tiny, they're still female chauvinists!

A droid picked up an abandoned child and decided to raise it.

From Population GO:
The manga adaptation of Gundam 0083. Years after the One Year War ended, in hopes of resurrecting the Principality of Zeon forces, Anavel Gato (also known as the "Nightmare of Solomon") steals a Gundam Unit 02 from the Earth Federation Forces. In the heat of battle Kou Uraki enters Unit 01 to confront Gato.

In 1988 an enigmatic explosion which has happened in Venezuela caused some mysterious case called "Lost Life Phenomenon". Indiscriminate murder, mass destruction, vanishing of an entire city... Some who got involved in the case say they saw a giant... Fast forward to 1991 in Japan. This is a story about girls who end up piloting gigantic humanoid weapons called "JINKI" fighting against their fate.

This manga started out in 2002 and had 9 volumes published, the "Complete Edition" came out in 2011 and had 3 'large' volumes instead, JUM will be doing the latter.

The manga centers around a certain boy who lives alone away from people, but harbors a special dream. One day, he meets a lone girl, and the story begins as he becomes part of the girl's destiny.

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.

Several thousands of years from now, there exists the Joker Galaxy of five Star Systems, where a long, long war is being fought. The god of light, Amaterasu, is trying to unite the galaxy under his rule. The fighting stands between giant mecha called Mortar Headds, their pilots, the Headdliners, trained since birth for their task, and the female humanlike computers called Fatimas, necessary for controlling the MH. Many are the lives and destinies found throughout the more than thousand year long era of war, although Amaterasu seems to live through it all.

Note: To honor its 25th anniversary, the series was reprinted under Five Star Monogatari Reboot.

Toyspress, a company co-founded by the author, published the English translation. To date, 26 Volumes of the English version have been produced, covering Vol. 1-10. The future translation remains uncertain.

Ryotaro is a boy who loves robots and lives out in the country with his three sisters, but he's headed to Tokyo for high school. Before leaving, he runs across a humanoid military robot and has a fateful encounter with its pilot, a cute teenage girl who calls herself La Vie en Rose. Ryotaro will almost certainly meet her again in Tokyo, considering his family connection to the production of these humanoid robots--his father worked with them.

The story and mythology of the Braves has already ended, and their star-spanning fable begins...

From MangaHelpers:
This is another story in the Full Metal Panic universe, set ten years after the events with Sousuke and Kaname. Ichinose Tatsuya is a pretty normal high school boy, who lives with his father and little sister Yukari. He has a tendency to fall in love with foreign women, which has never turned out well for him. One day, while up in the mountains driving a Power Slave to help out with his father's company, he runs into yet another beautiful foreign woman, called Adelina. He lends her a hand and is surprised to see that she has a military Arm Slave, called "Shadow," with her. What is this mysterious and highly armed woman doing up in the mountains? Tatsuya's life is about to get a lot more exciting.

Little kid Jin is a dab hand at mecha piloting (who'd have thought!), and when he isn't horsing around with other people's property, he's fighting against the evil forces of the Automen.

To go along with the Chou Soujuu Mecha MG translation patch (available on stargood.org), Phantom scanlated several chapters of the tie-in manga created to promote the game.

In the near future, large mechs called Labors are made to assist in various reconstruction projects in major countries around the world that are being threatened by global warming. In Japan, the government has enacted Project Babylon in order to conduct land reclamation. Labors are also being pressed into police and military service, aside from civilian use.
However, terrorists are now attempting to use Labors to make themselves heard, as well as common criminals, thugs and guerrillas. The National Police Agency established the Special Vehicles Division, an all-Labor task force to combat the potential use of Labors for criminal/terrorist activities.

Note: Won the 36th Shogakukan Manga Award for Shounen manga in 1991.

Lux, a former prince of an empire named Arcadia that was overthrown via a rebellion five years earlier, accidentally trespasses in a female dormitory's bathing area, sees the kingdom's new princess Lisesharte naked, incurring her wrath. Lisesharte then challenges Lux to a Drag-Ride duel. Drag-Rides are ancient armored mechanical weapons that have been excavated from ruins all around the world. Lux used to be called the strongest Drag-Knight, but now he's known as the "undefeated weakest" Drag-Knight because he will absolutely not attack in battle. After his duel with Lisesharte, Lux ends up attending the female-only academy that trains royals to be Drag-Knights.

An introverted Otaku was summoned to a Fantasy world, and successfully defeated the Demon King there. Just before the ritual to send him back to Japan was complete, the country's Princess dashed into the middle of the spell to be with him.

When they both opened their eyes, they realized they were transported to a Sci-Fi themed world than neither of them recognized. Working together, they must now survive in an unknown world and find some way to get home.

Han Qingyu lived peacefully for nineteen years, and never thought that one day he would become one of the main characters in an epic. An accident occurred out of the blue. The boy was forced wield a knife and began to face everything he knew nothing about: the invasion of civilization, the Azure Alliance, the mobile energy suit, the unique witness corps; the blade of exile, the sharp streams... He is narrow-minded, he is "The Qing Major" painted on cars and high-rise buildings in the era of full-scale military conscription; he will make the first cut in the Zenith War.