In this world there are mysterious machines known as TREMORS. The reason they came and who built them are still unknown.The most mysterious part of the tremors, however, would be their ability to continuously EVOLVE. And in this world a boy is on a journey looking for his missing father.

Shuuichi Inaba is a student of a special high school for young prodigies and one of the users of the newest and most popular application called 'Alice in Cyberland' - an app with an AI that enables its users to talk to them as with any other human. When some of the students of his high school start to get attacked by a mysterious culprit, Shuuichi is determined to find out who it is. In his investigation, he stumbles upon 'Alice' - a special kind of program, which, in return for helping him with the case, demands only to know something he would usually never tell anyone - his biggest and deepest secret.

From: Easy Going Scans

In the year 2038, a white light descended on the center of Tokyo and stole the memories of over one million people. The cause of this horrible incident was not determined, and no cure was to be found. The government formed a separate city beneath Tokyo to house and care for the victims of the incident and branded them as "KIDz." Regardless of their age, they truly are like children, and they must be retaught everything they once knew. Noa Ikurumi, who lives in this isolated society, is just taking one day at a time and dreaming of finally being allowed to go back out into the world. But Noa's life will once again change drastically on the day that he is taken hostage by a terrorist with some surprising information about his identity...

The story is set after the fall of civilization on earth due to resource scarcity. It follows the tale of Noru, a boy who shares resources with the people still left on earth. But Noru is not a savior. His goal is to record the fall of civilization on earth, to leave a record for the future generation.

It is the year 1999. In Nagano Matsushiro stands the pyramid of Japan, the private Voltstein Academy.

This place is famous for repeated occurrences of occult phenomena within its premises. Hence, it is also called the Occult Academy. The dean is committed to studying the occult, while the students are zealous in their everyday schoolwork.

One day, the dean passes away and his occult-hating daughter, Kumashiro Maya, visits the academy. There, she meets a self-proclaimed spoon-bending "time agent" from the year 2012, Uchida Fumiaki. As the two encounter various bizarre phenomena within the academy, the reason for Fumiaki's timeslip to 1999 becomes clear.

From TokyoPop:

After having finished a job at Research Colony Mendel, a mysterious mobile suit approaches the colony--likely with hostile intent. When Lowe Gear intercepts in the Red Frame, the pilot opens fire... and thus begins another exciting adventure set in the popular Gundam Seed universe! Mobile Suit Gundam SEED X Astray continues where Gundam Seed Astray R left off!

Great Mazinger starts after the defeat of Mazinger Z. Tetsuya Tsurugi is the new protagonist, piloting the powerful Great Mazinger, a creation of the once thought dead Kenzo Kabuto, the father of Koji Kabuto. This time the enemy is the Mycene Empire and its powerful robots.

In this school fantasy story set in the distant future, creatures contaminated by pollution have overtaken the land, forcing humanity to live in isolated mobile cities called Regios. One such city named Zuellni is a self-contained school in which freshman Layfon Alseif has just enrolled. Layfon reluctantly joins the 17th Martial Arts Studies Unit led by the third-year student Nina Antalk and embarks on a series of adventures.

An original side story that focuses more on Nina.

All humans in this world can use the power of the light of mana, and those who can't are considered to be subhuman 'Norma.' The world is like a peaceful utopia, and the celebrated princess Angelize leads a happy life. She believes that the only darkness left in the world is the existence of the horrible Norma. However, in a ceremony on her 16th birthday, the truth is revealed--Princess Angelize is a Norma. Now she is going to learn what her society does to Norma. She is sent to an isolated island full of others like her, who are taught that the only reason they are allowed to live is in order to fight to protect the peace of this world. Now "Ange" is part of a squad that pilots Paramails and fights invading extradimensional dragons.

Narue is an adorable schoolgirl with a secret. She's really an alien with powers right out of a sci-fi comic! But growing up is never easy, and sometimes it doesn't help when you're from outer space. Join our spunky heroine as she faces androids, alien invasions, and (scariest of all) her very first date!

Note: Won the Seiun Award for Best Comic in 2014.

It's the year 2269, and April Enus is working as a spy for the Alliance. She's known as "Venus" because of her special power: fatalities don't seem to happen when she's around. But is this power a blessing or a curse?

For most people, having one’s own mecha sounds like a dream come true. So when Eiji’s father builds him his own girl mecha to help around the house, he thinks life is about to take a turn down easy street. Unfortunately for Eiji, his eccentric father isn’t about to make it that easy, and his new mecha girl seems to have a mind of her own – one that doesn’t necessarily take to doing what she’s told. Will Akira-chan prove to help Eiji’s life, make it more complicated, or a little bit of both?

Kotarou has an clueless touch--he has an unusual type of ESP that is transmitted via physical contact. When he accidentally awakens his cousin Tatsuki's powers, he comes to realize that there is much more to his powers than he ever imagined!

Rain Jewlitt, known as the Methuselah, is a spaced-out, immortal, 624-year-old man dressed in priest's clothes. He's got eternal youth and a large price on his head—put there by those questing after the secret of his immortality.

Machika Balfaltin is a tomboyish, energetic 14-year-old girl who, upon the death of her grandfather, sets out to kill Methuselah, the one bounty her assassin grandfather, Zol the Grim Reaper, couldn't kill. Instead, however, Machika ends up being saved by Rain again and again from other aspiring bounty hunters attacking them both.

Sound like the beginnings of an odd relationship? You won't believe where their journey takes them...

From Infinity Studios:
With the invention of the automatic vacuum robot and the time-set video recording devices, what is the next breakthrough in home appliances? Why that would be cute female mini-robots that kill bugs of course! In Ichigeki Sacchu!! HoiHoi-san, a corporation in this alternate universe has created such a pest control agent and it’s the hottest selling item ever. Journey along with one enthusiast of these robots called HoiHoi-san’s and experience the joys & suffering of being a dutiful owner of these new adorable, bug killing, wallet busting machines.

A slacker high-school student gets pulled into a world where he is named the "Dungeon Master" and can control everything that happens. He can even make it rain money! It's in this world that he meets a young, traumatized girl who's memories have been erased. With her help, he creates a new game world to escape his boring school life. Everything seems to be going fine until they encounter a lethal bug in the game's programming.

From Seven Seas:

Being a girl is harder than it looks...
For Hazumu, this couldn't be more true, because just the other day, she...was a he.

Shunned by the girl of his dreams, Hazumu loses himself in the mountains and is promptly squashed by an oncoming space ship. The alien inside, feeling guilty, rebuilds Hazumu's body...but as the wrong gender!

Now Hazumu must learn how to be the girl his parents always wanted while dealing with the trials and tribulations of being caught in a love triangle between two girls--his childhood friend, Tomari, and Yasuna, the girl who rejected him but is now strangely attracted to him/her!

Maico is a charming young woman who also happens to be an android. Her creator built her to revitalize the flagging ratings for her radio station, as well as to probe the intricacies and weaknesses of the male libido. Maico quickly becomes entangled in a very human love triangle, not to mention the scandal and intrigue surrounding the station, its competitors, and the hordes of adoring fans that this sexy new personality attracts.

Mazinger Angels chronicles the adventures of four women who pilot giant robots in the Mazinger vein. The concept is a spoof on the late 70's and early 80's popular TV series Charlie's Angels.

Three of the robots, Aphrodite A, Diana A and Minerva X are from the original Mazinger Z series, while Venus A is from the Great Mazinger series. Their pilots are also traditional characters from Go Nagai's universe, Sayaka Yumi and Jun Hono from Mazinger Z and Great Mazinger respectively, and Hikaru Makiba and Maria Fleed from Grendizer.

The style of the manga highlights the sex appeal of both the characters and the mechas, sometimes similarly to the way Aika's female characters are shown. (taken from wikipedia)

From CPM:

An alien armada from Jupiter has amassed enough power to destroy all of Earth's defences. Earth's final hope lies in the Space Battleship Nadesico, a ship created using recently discovered extraterrestrial technology.
Can the Nadesico's rag-tag crew overcome their idiosyncrasies and defeat the alien fleet, or will Earth's last hope be lost?

The manga differs greatly from the anime