Here’s a tumblr page with free Kindle computer books. Most are not that interesting, but I downloaded a couple today.

I made one of these pages for free kindle SF books. The pickings aren’t good and there are 40 bad sf novels that appear every day. I got a few good ones, but you have to be picky. I did find this one:
With the Lightnings (Lt. Leary) by David Drake

Some David Drake is very good, some of this earlier stuff is lots of words, but I tend to lose interest. I am hoping that this one is a good one.