reFlower

reFlower is a simple application reshapes PDF your files into a Kindle-friendly form. Core functionality is based on k2pdfopt engine (reFlower is a TclTk/Python GUI over this powerful command-line tool). Select a PDF file, select text orientation (portrait or landscape), small or big margins, divide data into columns minimum 1 and maximum 4, and other options include straighten pages, native PDF, OCR (with GOCR), and kindle DX.