Swf2XNA is an open source program under BSD license, developed in C#, with it , you can make Windows/XBox/Win7 games by leveraging Flash for assets and layout, as well as using Box2D visually. It makes 2D games in XNA quite simple to make!
Download source code here.

P.S.
About XNA
Microsoft® XNA™ is composed of industry-leading software, services, resources, and communities focused on enabling game developers to be successful on Microsoft gaming platforms.

Apvlv is a cross platform open source software.

Like Vim, Apvlv makes people reading their PDF files just like using Vim.

So, Apvlv bindings lots of Vim command and its behaviour is like Vim. For example, < Ctrl-f > to forward page, < Ctrl-b > to previous page, ‘k’,'j’,'h’,'l’ to scrolling a page up, down, left or right, and so on.

And, Apvlv can understand that how many times you want to run the command.

The only thing you need to do is typing the number before the command. For example, typing ‘50′ and < Ctrl-f > will go forward 50 pages, typing ‘30′ and < Ctrl-b > will go previous 30 pages.

What’s more import is apvlv can support view a directory as content of a pdf document. Pressing ‘k’ or ‘j’ to move selected up or down, ‘h’ or ‘l’ to collapse or expand a dir, and press ‘t’ will open the selected document in a new tab.

for the last source code and pre-compiled binary, please visit http://code.google.com/p/apvlv/