I'm a bit confused as to why all of the replies so far are about whether or not the site is a Flash site. The OP already stated that it is driven by Flash - he wants to know how to produce something similar on a Linux machine.
To that end, I can't say I have a lot of experience. And unfortunately I don't have my Linux machine for development stuff anymore, so I can't test anything out. But there certainly is some software available for handling Flash in a Linux environment.
For playing Flash movies (and presumably accessing Flash sites), you can use
Gnash. It's not 100% functional, but if I recall it can play a lot of Flash stuff.
You can also get a Flash player plug-in for Firefox. Although it doesn't fit into the philosophy of open source software, sometimes you need a proprietary solution... =(
You may also want to watch the development of
gameswf. It's an open source library for compiling .swf files, and presumably it could be useful for developing interactive flash sites. It's also the backbone for Gnash.
There's a
long list at
osflash.org of open source Flash-related software. The list includes 4 different Flash IDE alternatives.
I don't have any experience developing Flash products in Linux (or in Windows for that matter), but I'm pretty sure you can get it done in Linux. You just gotta dig a little deeper and experiment with what people are already developing.
Good luck,
- Walkere