The kindlegen command-line program from Amazon is pretty easy to use, and supports ePub and HTML: http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000234621

The kindlegen command-line program from Amazon is pretty easy to use, and supports ePub and HTML: http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000234621 http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000... Works on Linux, Mac, and Windows.