KDP freebies:
Wrecker's Key by Christine Kling, 4th in her Seychelle Sullivan nautical captain mystery series, originally out from Ballantine in 2008. We've received the first few previously free.
Joan Hall Hovey Suspense Trilogy by the eponymous fellow MR member author. Includes her 2001 Kensington/Zebra-published thriller, which we have previously received standalone.
And Kill A Lawyer by R.J. Jagger, another in his Nick Teffinger detective thriller series. Doesn't actually have a corresponding paper copy (his books rarely do), so I suspect self-pub continuation, but since people have mentioned picking up and reading this series in previous iterations of this thread, might as well toss it in.