Some KDP freebies:
P.J. Parrish is the pseudonym of a sister team who write the Edgar-nominated Louis Kincaid mysteries for Pinnacle. They offer a tie-in tale to said published series, which is a prequel to their upcoming latest novel:
Claw Back
Steven Torres repeats his 2007 Dorchester/Leisure-paperbacked noir novel,
The Concrete Maze, and offers a new collection of shorts (tending towards sfnal),
The Box and Other Odd Stories
Previously KDP-included small publisher Camel Press offers some sort of humorous Da Vinci Code-esque impromptu buddy caper thriller thing by Mark Everett Stone with favourable reviews from Publishers Weekly and other venues:
The Judas Line (this is the author of the zombie PI spoof mysteries you might have picked up last year)
Established author self-pub: L.J. Martin aka Larry Jay Martin has written over a dozen westerns for Kensington's Pinnacle imprint and has apparently ghost-written some bounty hunter action thrillers for them as well in conjunction with Bob Burton, if I'm reading the credits/bio correctly. He offers a newly-written corporate ladder-climbing revenge thriller, if you're interested:
Windfall (pro-tip for aspiring backlist-releasers: Chalkboard is a step up from Comic Sans MS, admittedly, but it is still not a good font to use for your cover titles)