agl’s jbig2enc is an encoder for JBIG2:
www.jpeg.org/public/fcd14492.pdf

JBIG2 encodes bi-level (1 bpp) images using a number of clever tricks to get
better compression than G4. This encoder can:
* Generate JBIG2 files, or fragments for embedding in PDFs
* Generic region encoding
* Perform symbol extraction, classification and text region coding
* Perform refinement coding and,
* Compress multipage documents

It uses the (Apache-ish licensed) Leptonica library:
http://www.leptonica.com/

Jbig2enc can convert other format image to jbig2 or fragments for embedding in PDFs, and pdf.py can convert the fragments to PDF document.
for example, if you want to convert a.bmp to pdf, you can do it in this way
jbig2 -s -p a.bmp
you get output.0000 and output.sym files
python pdf.py output>jbig2.pdf
btw, itext and itextsharp also supports convert jbig2 to pdf now.
After some efforts, I have successfully compiled jbig2 under Window XP with GCC 4.2(MingW32+MSYS), for details and download, please visit Windows version of agl’s jbig2enc, from this page, you can also download the linux compiled version.

reference,
Windows version of agl’s jbig2enc
agl’s jbig2enc home page

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

PowerPoint to Silverlight Convertor(PPTX2Silverlight) is an open source application for windows developed in WPF, and it has the following features,
* PPT Convertor with WPF interface
* Presentation Gallery Control (fish-eye) to Show and Launch Converted PPT’s
* Custom Web Server for Hosting Converted PPT’s (No Dependency on IIS)
* Reusable PPT Viewer Component Showing Slides in familiar PowerPoint Look and Feel
* Slide Navigation Controls (backward-forward)
* Full Screen Mode in PPT Viewer
* Built with Silverlight 2.0 RTM
* Available with Installer
for detail, please visit http://pptx2silverlight.codeplex.com/