If you're looking for manga similar to Gargantia on the Verdurous Planet, you might like these titles.
The distant future: In a universe where humanity's mortal enemy is the alien race known as Bugs, an Imperial battleship suffers a mysterious and devastating attack that sends Captain Alan Corinth crash landing onto an unknown planet. Much to his surprise, rather than the technologically advanced humanity he knows, the humans he encounters there seem to live in a fantasy world filled with swords and magic!
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Advanced spaceman crashes into another world that has lower technological development, only difference is this world has magic.
In the year 3195, there was a war between an army of robots and the humans. When Shaian, a sentient combat armor, lost his companion in battle, he shut down until his internal systems spotted a new human. It's now almost a 1000 years later, and Shaian's greatest enemy is still alive and doing battle in Brazil. With a new friend`s help, Shaian may be able to stop this evil force before another war rages over the continent.
The Autobots and Decepticons have been locked in a brutal civil war for eons, and now their battle has come to Earth! The Autobots seek peace and coexistence, while the Decepticons seek power and control. Earth and its populace are caught between the two as these mighty factions go head-to-head. Transformers took the world by storm shortly after their debut, and these previously uncollected stories were a vital part of that takeover!
On a primitive planet with fauna similar to Terran dinosaurs and Ice Age critters, one of the angolmois energy capsules spread by the explosion of the Nemesis has affected the locals. A gang of evil dinosaurs have been transformed into Destrons, and a battered Lioconvoy is too injured to stop them. So he transfers his energy into a mammoth named Big, charging him with continuing the good fight.
All across the universe, the forces of the Maximals and Predacons are at war... and the Maximals are on the losing end! At the central headquarters of their army, a Convoy receives report after disastrous report from the battlefield, and thinks of the small team of warriors led by Lio Convoy, fighting to keep the Angolmois energy of the planet Gaea out of the hands of Galvatron...