Text-Reader Bookshelf - description from Softdepia.com:
Bookshelf takes plain text (TXT) files and displays the contents as if they were printed in a book. You get two pages (or one if you wish) side by side with generous margins and a clean, uncluttered interface. You can click the pages to turn them. It has a wide choice of page styles and convenient navigation system.
Bookshelf easily allows you to come back to the read books and to open them in the place where you have stopped
Text-Reader Bookshelf is a "Free to try" program. You can download and try it for an evaluation period.