What Early Access games are worth watching at this time?

Divinity Original Sin has a huge list of updates, each with a youtube video explaining the changes and such. Larian is a very experienced team, and from what I have played I will enjoy the finished project immensely. The music is great, the world is amazingly open, good writing, dialog system, turn-based combat. Just amazing.

SpeedRunners gets a hearty recommendation from me. All of the mechanics of the game work just fine with the only real problems right now being from a more balanced matchmaking and people still complaining about lag. There is currently a dev sponsored tournament in progress as of me writing this message. Also a summer update is possible. They respond to the discussions on the Steam forums that are posted fairly quickly too.

I've played 27 hours of Adventurer Manager so far (i'm playing right now, actually) and it's been lots of fun. The devs are very active on the community, and the game is fully playable. Really recommend this one.

gnomoria and prison architect are both pretty great as they are now, and getting regular updates. i just started playing spacebase df9 yesterday and i'm liking it so far but expect there isn't a lot to it yet.

Dungeon of the endless? :D

The Forest.

Damned, Nosgoth and Flockers. :)

Landmark's been receiving constant updates and should enter open beta near the end of the summer. :)

No love for Carmageddon:Reincarnation ?

Starbound is pretty good right now.

I also have my eye on Popup Dungeon, which has just been both Kickstarted and Greenlit, but won't be available to play for at least another year (and won't be released to the general public until 2016)...but they offered Early Access to those who contributed on Kickstarter. It seems like a pretty promising game, from what I've seen of it so far.

Rust, it was already playable and funny on its release.

Talking about not superior famous games:

Endless Legend - Best strategy this year even Early-Accessed (IMO of course). Great mix of Civilization and Age of Wonders. The only thing I don't like is interface.

The Age of Decadence - Gorgeous RPG with turned-based combat and significant choices. And it's post-apocalyptic fantasy world (never heard of something like this before)!

H1Z1,the Forest

Vertiginous Golf is a pretty interesting take on the golf genre, and the devs seem pretty active with the new content and updates so far. Basically if you wanted to feel like you were playing mini golf in Bioshock's Columbia give it a try!

Wasteland 2, Divinity: Original Sin, Maia, War for the Overworld, Planet Explorers

While not a fan of early access AKA paying the devs to beta test, I keep looking at SNOW. Looks like a lot of fun. And since I liked the SSX series... If I had the money, damn things like rent..... I'd try it out.

http://store.steampowered.com/app/244930/

KSP, Star Bound, Next Car Game and Space Engineers are the ones I really enjoy.

Too bad StarForge aplha is kinda dead, I expected good things from that game.

Folk Tale, Next Car Game, Carmageddon Reincarnation, Kerbal Space Program, Space Engineers, Masterspace, Rust, Dream, Imagine Earth. ----
Not playable for now but worth waiting:
On Greenlight: Universim.
And sometimes in future: Clockwork Empires!

As for what I have bought and enjoyed. That'd be prison architect, spacebase ds9, and kerbal space program. Another I'm eyeballin is contagion

Disco Dodgeball-despite the game being made by only one guy, it seems to be going quite well and even the community seems to be more normal than the average you can find at early acces games discussion hub

Starpoint Gemini 2 - at the moment game is in beta(polishing) and works fine.The game itself atm is a big sandbox but everybody is waiting for devs to add the story.