Quality devs?

Dunno, I guess:
CDProjekt Red
Piranha Bytes
Obsidian
Techland (only played Dying Light which was awesome, and Dying Light 2 will be ever better with Chris Avellone and some CDPR guys writing the story and what not)
Crate Entertainment - Grim Dawn guys

tinyBuild

CDPR and Bethesda Games Studios. And on PS4, most Sony first-party studios are hitting it out the park in recent years, especially Naughty Dawg.

Klei, 11 bit studios, CDP Red, Zachtronics, Daedalic, Amanita are great devs. :)
No one mentioned Paradox.

Lots of good ones already mentioned, but I'll add Platinum Games and, for me at least, Yakuza Team

Arkane studios never failed a game till now..except the damn shitty DRM on their last games, but it's publisher fault..about indie 10Ton released very funny game like neaon chrome, crimsonlnads , jydge,etc

Your top two (Klei, Zachtronics) were the first two to come to my mind.

Then I thought a little more:
Firaxis Civilization and XCOM reboots? Yes!
DONTNOD I know it got mixed reviews and didn't reach its potential, but I liked Remember Me, on the whole. And I'm ready for more Life is Strange from them.
Double Fine While I've enjoyed all of their games (that I've played), their good will is probably expended, after Spacebase DF-9's abandonment and the Broken Age funding/hype debacle.
Asymmetric Okay, they only have one game on Steam, but I've been playing their web game for almost a decade, and their one Steam game exceeded the already-high expectations I had for it.

Oh, yeah, Supergiant, too. (Seconded, from your list.)

A few out of ones you already listed + Double Fine Productions, Edmund McMillen, Jonathan Blow and Michel Ancel :)

bmc studio (now to wait for people to look it up)