From eBook Converter:
Kindle PC Converter quickly and easily convert eBooks in Kindle for PC to PDF file. user can view PDF eBook on other computer or device, also can print Kindle eBooks without limitation. it is 1-click converter and easy to use, simple and fast, with no complicated options. The program adjust to best eBook resolution automatically, this ensures perfect conversions into PDF.
Key Features One-click converter. Adjust eBook screen size automatically Perfect conversions into PDF. Optimize PDF file for e-reader.
Free version leaves what they call a "watermark", but it is more like a big bold red blind spot across every page. Annoying and not acceptable. A little slow to process the conversion and I was unable to use my computer to do anything else while it "worked" as my cursor kept bouncing all over the place when I tried to navigate to other programs.
Not terrible if you don't mind waiting for the process and the big red "watermark" on every page.