If you're an audio fan, Lindsay Buroker has all of the full-length Death Before Dragons free to listen to on her YouTube channel. The two most recent releases aren't posted yet, but she plans to do so. Also the complete Agents of the Crown series (5 books) is there as well. I think she said there's like one skippable ad every hour (maybe half-hour), but free to listen to.
Those are the two series I just bought.

I have a lot of her stuff from the various times it's been free over the years or on sale. Currently I'm reading her Emperor's Edge series which was her first series. But I've read some of her other books already. She writes quirky characters with lots of banter. Mostly light on the romance, but so far there usually is at least one in each series.
She also wrote romance as Ruby Lionsdrake (all of which used to be wide—I remember buying some from All Romance eBooks back in the day—but are now only in KU). I have only read a few so far, but have more in Mount TBR.
So many books, so little time.
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For any Nalini Singh fans:
These free tickets to a Q&A on June 1st are going fast.
Author Talk with Nalini Singh
I'm not part of their library system so just left the card number and PIN fields blank to register.