D&D 5E 3PP on KS that you like

[Stormonu]

Archon - Dungeons & Lasers and Rampart; mostly for cheap tabletop scenery
Legendary Games - seconding here - they do themed monsters, campaign settings and the like

 

[Sacrosanct]

Kobold Press
AW
Legendary Games
Necrotic Gnome

Missing from this list is a book you edited. Well, that doesn't look good for me if my editor isn't stoked about it....

 

[Darrin Drader]

Missing from this list is a book you edited. Well, that doesn't look good for me if my editor isn't stoked about it....

That was a list off the top of my head. I am absolutely stoked about Twilight Fables!

 

[Libertad]

Kevin Crawford's current KickStarter is of the Atlas of Latter Earth, which will further expand on the science-fantasy setting detailed in Worlds Without Number. There will be setting-neutral rules, as usual.

Beyond just making high-quality works, Crawford's KickStarter projects have a consistent track record of being timely, transparent, and communicative with backers. I own a good portion of his product catalog and backed some of his works, and I don't regret any of these choices.

 

[CleverNickName]

I backed the "Seas of Vodari" and "Under the Seas of Vodari" Kickstarters, both by Tribality Games. They are excellent, and I recommend them highly.