2016 mecha science fiction, 26 episodes: AniDB, vt Black Relic. In the near future, a UN research station at the Kurobe Dam is looking into some ancient artefacts… and enigmatic aliens start to invade Earth.
2016 alternate history mecha science fiction, adaptation of a manga spinoff of a visual novel, 12 episodes: AniDB. In 1983, the 666th Tactical Surface Fighter Squadron of the East German Army is the only force between the invading alien hordes and the rest of Germany.
2016 mecha science fiction, 12 episodes: AniDB. In a very changed world, Kazuki Azuma leaves an island in the sky to return to Japan, and gets involved with power struggles and giant robots.
2015 science fiction, 26 episodes: AniDB. Mecha pilots fight against the corruption of words.
2015, 12 episodes: AniDB
Mecha series, continuation of last summer's Aldnoah Zero. The Martians are still invading Earth, but things have bogged down.
2014-2015, 25 episodes: AniDB; vt Cross Ange: Rondo of Angel and Dragon.
In a magical/tech society, the princess is discovered to be a non-magic-user, stripped of her rank, and exiled to the high-casualty, low-empathy defenders of the kingdom.
2014, 12 episodes: AniDB
Mecha series. The Martians are invading Earth, and their technology is overpowering. But some Earthlings are able to fight back.
2013-2014, 24 episodes: AniDB
On the Star of the East, Oda Nobunaga fights his local battles against other warlords (with Giant War Armour, of course). But the Star of the West is approaching, and the stakes are about to get vastly higher.
In the late Edo period, Perry's black ships were fought off by giant mystical mecha. Twenty years later in Nagasaki, a young yakuza boss has just unified the town under his rule by beating up everyone who objected. But he's got bigger things on the way...