Here are some I've read and enjoyed, although I've honestly no idea about dates - to me good is good so I'll stick to that: note you've likely come across a good few if you've been following the other threads in the comics section but I'll post a block here for this thread and to help start things off.
Yiu
Yiu Digital Comics - Comics by comiXology: Web UK
If you've ever seen any artwork from Warhammer 40000 (the miniatures game) then you'll see the very same appearance of gothic futuristic style in this. A wartime struggle of one assassin and her quest to save her brother in a futuristic world with a strong religious ruling class and an almost mystical/ghost in the shell approach to machines.
Great fun, a very action orientated story with some great artwork.
Completed series
Uber
Uber Digital Comics - Comics by comiXology: Web UK
First season is finished and Uber Invasion has started now. Alernate WWII story which jumps between a series of characters in a very "Game of Thrones" style as it follows the changing history of the world when a mysterious message is decoded which contains methods to alter the human genetic code. The result is super-human individuals with god-like powers. However this is NOT a super-hero comic in the least. Indeed until I wrote this I never really even thought of it as a super-hero style comic at all. It's super-human not super-hero.
Good artwork and very solid story and a very much top recommendation (so long as you don't mind blood).
First series complete second ongoing.
Chronicls of the Dragon Knights
Chronicles Of The Dragon Knights Digital Comics - Comics by comiXology: Web UK
This is a collection of stories each complete to a single comic issue which detail major events and individuals within the world of the Dragon Knights; virgin female fighters immune to a warping madness spread by mighty dragons. The stories link into each other one after the other in a casual sense that you can see major events influence the future; but each one can be readily read alone or even out of order if you wish. This isn't a complete series, although the speed of publication is very good.
Ongoing series
Blacksad
Blacksad Digital Comics - Comics by comiXology: Web UK
It's America of post-WWII era and the time of the private investigator; mixed with the politics, racial elements and all from those times. Mixed up with anthromorphic characters instead of humans; which is taken to give its own twists toward things. Follow the intrepid PI as he tries to uncover murder and other crimes. Gritty edge to it and strong story!
Completed series
Elves
Elves Digital Comics - Comics by comiXology: Web UK
There's a selection of these collections including Dwarfs and I think a few others. They are originally French and translated well into english. High detail artwork; strong story lines and each one is a complete story unto itself. They detail adventures and quests of different elves over the world and time. Not a huge amount of inter-connectivity but great reads on their own right.
Ongoing series
Legend of the Scarlet Blades
Legend of the Scarlet Blades Digital Comics - Comics by comiXology: Web UK
Izuna
Izuna Digital Comics - Comics by comiXology: Web UK
Two connected series set in the mystical orient. Great story, mythical characters and the age old battle of man VS nature/the wilds/magic. There's a 3rd Izuna publication now, but only in French (I'm very eagerly hoping for its translation and release). The two series stand alone, but Legend of the Scarlet Blade is the first series that sets the world and many of its themes in motion.
Artwork is very reminscient of old Ghibli films and certainly gives me a feeling of that age of animation in the style used.
First complete, second ongoing (poss complete if you can read french)
Saga
Saga Digital Comics - Comics by comiXology: Web UK
This is one of those series where if you glance at the preview artwork you might well walk right past it. DON'T. The characters are quirky; the world a little on the strange side but its a top rate story that sinks its claws into you and won't let go. Be prepared for heart-ache and pain as you see characters on different sides of the conflict fighting together and against each other and discover their own internal struggles. A very refreshing experience to have a series with multiple protagonists where you can quickly find that who you thought was evil/bad isn't and who was good might not be quite so nice.
Of all the comics I'm listing this is probably the most current popular one. It's still ongoing.
East of West
East of West Digital Comics - Comics by comiXology: Web UK
The end times are nigh; the four horsemen are walking the Earth; men are fighting; a father seeks his son; this is a chaotic world on the brink of the end. A fantastic mix of fantasy, mythology and a futuristic setting against a largely western era backdrop with gunslingers; but also going all the way to the orient. Another really top series and still on-going.
Monestress
Monstress Digital Comics - Comics by comiXology: Web UK
Fantastic artwork and a story set in a mythological and brutal world. This is a mysterious story with some very adult themes as our protagonist tries to understand the world whilst fighting against oppression and the rumblings of war. I must admit I've not actually read some of the newer publications, but I've continued purchasing to keep up until the series is published as I hope to read in a block (may 17 is the date for the last issue in this story arc)
Death Vigil
Death Vigil Digital Comics - Comics by comiXology: Web UK
Great artwork, interesting story and well worth a read if you like the idea of hidden societies; ghosts ghools and magic. Really great characters and the author/artist is one to keep an eye on for other publications (his other Switch series is very highly regarded as well). First series is finished but there's more than enough story for more to come and high hopes that a second series will come.
Aliens 0 multiple series
Aliens Digital Comics - Comics by comiXology: Web UK
Mostly older, but well worth it for a return to the grim world of Aliens. Most of them are either written before or take heavy inspiration from those early first two films (indeed some comics are set right after the first film). So most really do bring you back to the golden era of the Alien.
Conan
Chronicles of Conan Digital Comics - Comics by comiXology: Web UK
Old but I'm throwing this in because I honestly think that as a sword swinging adventure they are still fantastic and have a writing style that ideally fits the publication in comics; something that I feel is lacking in some more modern attempts at such characters (mostly limited to Dynamite publisher now and their newer Red Sonja series which, to me, feels like its totally lost its way and that they've burned out their good ideas on it).