PDFMiner is a suite of programs that help extracting and analyzing text data of PDF documents. Unlike other PDF-related tools, it allows to obtain the exact location of texts in a page, as well as other extra information such as font information or ruled lines. It includes a PDF converter that can transform PDF files into other text formats (such as HTML). It has an extensible PDF parser that can be used for other purposes instead of text analysis.
for details, please visit Extract and Analyze Text Data of PDF Documents with PDFMiner

pdf-parser.py
This tool will parse a PDF document to identify the fundamental elements used in the analyzed file. It will not render a PDF document. The code of the parser is quick-and-dirty, I’m not recommending this as text book case for PDF parsers, but it gets the job done.
for details, please visit, PDF Tools

PyPDF

A Pure-Python library built as a PDF toolkit. It is capable of:

• extracting document information (title, author, …),
• splitting documents page by page,
• merging documents page by page,
• cropping pages,
• merging multiple pages into a single page,
• encrypting and decrypting PDF files.

By being Pure-Python, it should run on any Python platform without
any dependencies on external libraries. It can also work entirely on
StringIO objects rather than file streams, allowing for PDF
manipulation in memory. It is therefore a useful tool for websites
that manage or manipulate PDFs.

for details, please visit http://pybrary.net/pyPdf/

Google Book Downloader is small utility(developed in .NET) which allows you to save book as PDF from google to your local filesystem and with many features,

• Download any book from Google Books marked as ‘Full view’
• Partially download any book from Google Books marked as ‘Limited preview’
• Access to any book available only for US citizens (instructions)
• Searching for hidden pages (not indexed by Google Books)

The Google Book Downloader application allows users to enter a book’s ISBN number or Google link to pull up the desired book and begin a download, fishing off with exporting the file to a PDF.

P.S.

If you want books, but don’t want to pay for them, there is a better way than walking into your local book store and pocketing them. Try grabbing them online, from Google!

Everyone must be aware of the Google Books Library project by now. If you’re not, it’s basically a way for Google to ensure all of the world’s book content is accessible and searchable. Through the Book Project, Google works with libraries to scan and archive their older and out of print materials.

–from How to download books from Google

references,
* How to use Google Book Downloader?
* How to use geolocation to download a book available only for US citizens?
* Google Book Downloader Homepage
* Google Books Library project

Today I recommend a free open source program, bookbinder, with it, you can easily create a bindable book from a PDF document.

Bookbinder is a program that will convert a PDF document into signatures suitable for traditional bookbinding.
While there are a lot of programs on the net that will create a single booklet from a small document, I couldn’t find one that would turn a 500 page novel or textbook into several signatures. So I had to write one.

The chosen PDF is split into chunks, the page order of each chunk is rearranged, then the pages are placed two to a page in a new PDF. After printing and folding, each bundle of sheets should be a correctly ordered signature, ready for binding.

Something like this…

The program does steps 1 and 2. You have to do the rest to create a finished book.

The gui screenshot is like this,

and it support 3 formats, booklet, perfect bound, signatures.

If you like it, please visit here for details and download it.