Just for you (it was already posted in this thread):

To build your own working Ripple network, you need at least 1 rippled server, code at:
https://github.com/ripple/rippled

That's it already, but I guess you want some infrastructure with it?

Then you likely want to have a client instead of writing your own, you can use the one at:
https://github.com/ripple/ripple-client (written in JavaScript)
or you can write your own either using the API or one of these 2 libraries:
https://github.com/ripple/ripple-lib-java (Java)
https://github.com/ripple/ripple-lib (JavaScript)

If you want to store the encrypted blobs for your customers (so they can switch computers and still access their wallets in a secure way) you can set up this server too:
https://github.com/ripple/ripple-blobvault

Afterwards you might want to publish your trades to bitcoincharts.com? There's some code for that!
https://github.com/ripple/ripple-chart

Bitcoincharts is operated by MtGox and closed source though... you'd rather have your own charting website, fully Open source, right?
https://github.com/ripple/ripplecharts


Oh, by the way I operate my own rippled server already for quite some time now, after you know how to compile it (...it is a single command) and where to find the binary then it's smooth sailing from there.

Edit:
ripple.com as in the HTML code for the website?! Or do you actually mean ripple.com/client - the code for that is linked above.