Baen publishes only science fiction and fantasy titles, and touts their offerings as “powerful plots with solid scientific and philosophical underpinnings are the sine qua non for consideration for science fiction submissions. As for fantasy, any magical system must be both rigorously coherent and integral to the plot, and overall the work must at least strive for originality.”
I’ve found several great science fiction eBooks on this website – why not peruse it for yourself: you might find something you like? Once you click the link above, click on the “Books” link on the left-hand side of the web page. From there, you will see a good list of free material if you sort it by price low-to-high. Make sure you give that a shot as you will see more free material offered than just clicking the “Free Library” option.
Once you click on one of the books and read its description and want it, you can download the Kindle version to your computer and then transfer it to your computer.
Once you have downloaded it to your computer, you will need to transfer it over to your Kindle. It’s pretty easy, and you can click here or type in http://smarturl.it/xfer into your web browser for my instructions on how to do it – this is the same guide I charge 99 cents for in the Amazon Kindle store, but you can read it for free by clicking the link.
Download the Free Kindle Books and Tips blog app for your Kindle Fire or Android-based smartphone or tablet – for free, of course – by clicking here or type in http://smarturl.it/fkbtfreeapp into your computer’s web browser from the Amazon App Store or click here or type in http://bit.ly/fkbtgoogle into your computer’s web browser for the Google App Store.