From ADV Manga:

On the planet Aqua, a world once known as Mars, Mizunashi Akari has just made her home in the town of Neo-VENEZIA, a futuristic imitation of the ancient city of Venice. The technology of "Man Home" (formerly Earth) has not entirely reached this planet, and Akari is alone, having no contact with family or friends. Nonetheless, the town, with its charming labyrinths of rivers and canals, becomes Akari's new infatuation, along with the dream of becoming a full-fledged gondolier. Reverting to a more "primitive" lifestyle and pursuing a new trade, the character of Akari becomes both adventurous and heartwarming all at once.

From: Easy Going Scans

A Demon Lord spirited the Princess away, and cursed her with eternal sleep. Countless knights sought to save her, only to die in vain by the Demon Lord's hands. But then, a Nameless Knight arrived to vanquish him and save the Princess, ignorant of what fate had in store for him...

The Golden Age of Pirates

In 1715, pirates established a lawless republic in the Caribbean and ruled the land and seas. These outlaws paralyzed navies, halted international trade, and plundered vast fortunes. They threatened the power structures that ruled Europe, inspired the imaginations of millions, and left a legacy that still endures.

Into this world sails a young, cocky, and fearsome captain named Edward Kenway. His skill with a sword and disdain for authority earn him the respect of pirate legends like Blackbeard, but thrust him into an ancient conflict that threatens to destroy everything the pirates have built.

Some robots go trick-or-treating.

From Rayns&Lele Scans: A devastating disease called Melancholia spreads across certain areas of the city, causing the unfortunate person to lose their memories of their most important person. Kazanami Toki is unaware that he has caught the incurable disease, but "by chance" he meets his forgotten lover, Hanamiya Yuna. After their fateful encounter, he is left with a strange feeling he is unable to understand...

From Horobosu Scanlations:

"Seriously, I'll finish you within three hours."

That's what Kirishima Haru had in mind when he entered the virtual world of a dating sim. Haru's had it all since childhood - looks, charisma, good grades, athletic talent and girls, but in this virtual world, Haru would meet the only thing he wants and unable to attain. At the edge of the incomplete world, the love story of a player and a NPC unfolds.

In a world driven by fictionalized friendship, courtesy of the program named "Real Account", the table suddenly turns, and the cybernetic world turns real! How will they survive?

Note: So... This manga is technically a two part... the first 10 chapters are part 1 and the 11 onward is part 2. In the past it's been split up into two series(Real Account & Real Account II).

A man with amnesia wakes up in a strange world.

"I'm sorry I don't bear much resemblance - I love you."

Yamada Torao commits suicide after the loss of his lover and wakes up from suspended animation 250 years in the future. The android tasked with assisting him that treats him kindly and with tender care is the disappointing robot of his former lover at a "30% reduction"...? An intense future love story about a stubborn young man who learns to accept love and pursues his aspirations.

A one-shot taking place after the destruction of the world by the Devil Moon. It's about a half-mage who works as the executioner of mages and a girl-mage who suddenly appears before him.

The manga adaptation of the latest RPG in the Persona series from ATLUS: Persona Q: Shadow of the Labyrinth. One stormy autumn night, the P3 gang is bummed that Gekkoukan High School's Culture Festival was canceled due to the weather. But out of nowhere, they hear a bell begin to ring. The next thing they know...

From Village Idiot:

Hideo Kawamura has a really terrifying look, but soft heart. While contemplating suicide, he stumbled upon this computer that contained the virus, "Wiruko", who convinced him to join the "Seimahei", a fighting tournament that has the world as its prize. However, Hideo happens to not have any fighting skills whatsoever, so he has to get through on his wits (and luck) alone.

Aidie is KN Group's mascot robot that has been greeting the employees every morning. Its creator, Professor Harvey, takes Aidie on the day of his resignation and risks his life to protect it from the company. What secrets does this one robot hold? The author ended Aidie abruptly after Chapter 46. Author/Artist: http://tapastic.com/sangjin66

From Easy Going Scans:

"Year 252 M.C, in this era which plants are almost extinct and the land is barren, a strange disease developed. 'Shinigami's flower,' the unique lethal flower that carries death." The disease is curable if found in the early stages but if left till transformation stage it becomes lethal and the only option left is extermination. These are all dealt with by request to 'Gokurakuen,' the national medical institution specializing in dealing with shinigami's flowers.

Our protagonist, Doctor Ichinose Souma, is the class representative of Mobile Team Unit Class 1. As his class gets too few requests, he and his assistant Hina often get into trouble interfering with other class's jobs.

Wakaba meets a strange duo of a girl named Chao and her robot partner.

It's an age where aliens, monsters and other dangers threaten the Earth, and various heroes have risen to protect it. Supporting these heroes are the human defense forces, of which the sisters Kitajishi Miyuki and Yuri are a part. Specifically, their office is for hero consultation, and they help heroes solve their problems, but they also help evacuation procedures during emergencies. Yuri was formerly an immensely powerful and popular magic girl, but now she helps protect people in a more human way. In their first case, they consult with a hero who has lost his powers, and is trying to find a way to live as an ordinary human.

It is Universal Century 0079, at the end of the One Year War between the Earth Federation and the Principality of Zeon. The space colonies of Side 4, or Moore, were previously destroyed by a Zeon attack, and many colonists lost their lives. Side 4 became a shoal zone filled with the wreckage of destroyed colonies and warships, lit by constant flashes of lightning due to collisions between electrified debris. It soon came to be known as the "Thunderbolt Sector."
The Moore Brotherhood, an Earth Federation Forces unit made up of surviving citizens from Moore, set out to exterminate the Zeon forces in the Thunderbolt Sector in order to reclaim their homeland. To halt the Federation advance, the Zeon forces deployed their own Living Dead Division, which was established to collect combat data on soldiers with prosthetic limbs.
Io Fleming, though part of the Moore Brotherhood, hates being tied down by his homeland and family history. Daryl Lorenz, having lost his legs in earlier battles, is now an ace sniper of the Living Dead Division.
When they confront each other on the battlefield, they will reach a mutual realization.
These two are destined to kill each other.

From Yen Press:
No matter how much the times change, bullied kids aren’t going anywhere. And fat junior high school student Haruyuki is one of them. But one day, Haruyuki encounters Kuroyukihime, the most beautiful and elegant girl at school, who gives him a mysterious program: “Brain Burst”…and the secret of the “Accelerated World.” He may be at the bottom of the food chain at school, but Haruyuki and his destiny begin to “accelerate” with incredible speed in the virtual realm as he aims for the top.

The accompanying 4koma for Accel World.