http://www.aldiko.com/ is an eBook reader application that runs on any Android phone and which enables you to easily download and read thousands of books right on your smartphone.

[edit] Features

• Download thousands of books to your phone right from the app. No computer, no cable, no subscription. Tens of thousands of titles available for free.
• Browse extensive online book catalogs, supports the OPDS catalog standard.
• Read detailed descriptions and online books reviews before you download.
• Quickly find the book you are looking for with our powerful search tool.
• Browse your collection by title, author or subject. Edit your book's detail information. Rapidly find what you are looking for using our search tool.
• One-click access to the books you are currently reading right from the home screen. We'll resume the book right where you left it the last time.
• We help you arrange your books by tags ('novels', 'science-fiction', etc.); of course you can always add your own. You can also group your books in your own custom collections.
• Comfortable reading experience with full screen view. Customizable navigation modes using the touch screen and intuitive fling or tap gestures.
• support auto rotate if available on your device, manual rotate is also available.
• Personalize your reading experience. Adjust the font and background color, font size, margin as well as the display brightness to best suit your preferences.
• Adjust the brightness of your display by sliding your finger along the left edge of the touchscreen.
• Easily switch to Night mode when reading in low-luminosity areas. The Night mode font and background color are fully customizable as well.
• Create your own bookmarks anywhere in the book. Rapidly navigate to any given section through the Table of Content.
• Library book checkout support.
• ADE with or without DRM support.
• Supported formats: ePUB, PDF