If you want to read Free Online Books, or Download them the following sites are use full and have a variety of different Categories of books. for read and download.
Digital Libraries offer an online, interactive complement to World Book’s newest print reference sets.
Each library features all the content from the print set as well as videos and animations, interactive activities, Web sites, lesson plans, curriculum correlations, and links to encyclopedic content.

Key features include:

• Easy-to-read content.

• Translation tool generates content into 13 languages

• Text-to-speech feature allows students to highlight text and hear it read aloud

• Video tutorials and animations help visual learners grasp difficult concepts
Sites:
http://www.e-book.com.au/freebooks.htm
http://www.worldbookonline.com/training/digital_libraries/index.htm
http://www.saeedbookbank.com/
http://www.alislam.org/books/