Unrar Extract and Recover is an open source solution to password recovery and mass extraction of RAR compressed archives. Handles password protected, multi-part and encrypted header archives with ease. Portable, no installation required, minimal memory footprint.

It provides manipulation (extraction and listing of embedded information) of compressed RAR format archives by interfacing with the unrar.dll dynamic library for Windows.

It’s purpose is threefold :

1.Extracts .RAR archives and can list information embedded inside the archives
2.Using multiple passwords to protect your files?
It frees you from having to remember each individual password by keeping a single password depository so letting you choose as many passwords as needed.

3.Have you forgotten the password of a password protected archive?
Can retrieve the password by using the dictionary attack method. Give it a wordlist and it will attempt all words against the archive. Once it retrieves the password it continues with extracting the archive.
Unrar Extract and Recover is also a portable software.
Want to download the source code or executable? Please visit here.

wkhtmltopdf is a Simple shell utility to convert html to pdf using the webkit rendering engine, and qt.
Requirements:
To compile this project requires:
* QT 4.4 or above
* CMake 1.6 or above
* Subvertion (For SVN builds)

Compiling:
To compile and install the source from svn issue the following commands:

svn checkout http://wkhtmltopdf.googlecode.com/svn/trunk/ wkhtmltopdf
cd wkhtmltopdf
cmake -D CMAKE_INSTALL_PREFIX=/usr .
make
sudo make install

Note this only works on none Windows platforms. As the code is written using QT and CMake it should be easy to compile on Windows, but as I do not own a copy of the said OS, I cannot tell you how.

Usage:
To convert a remote HTML file to PDF:
# wkhtmltopdf http://www.google.com google.pdf
To convert a local HTML file to PDF:
#wkhtmltopdf my.html my.pdf
You can also convert to PS files if you like:
#wkhtmltopdf my.html my.ps

reference,
wkhtmltopdf Home Page
wkhtmltopdf SVN

http://www.daimi.au.dk/~jakobt/#wkhtmltopdf

Just Noticed a pure JavaScript library to generate PDF document today from twitter.

jsPDF is an open-source library for generating PDF documents using nothing but Javascript. You can use it in a Firefox extension, in Server Side Javascript and with Data URIs in some browsers.
More examples and features to come. Get in touch if you’d like to help out! :)
See Demo
Client-side demo works best in Safari or iPhone Safari. Also works Firefox 3 on Windows and Opera. IE support on the way.

reference,
http://code.google.com/p/jspdf/
JSPDF Demo