There does not appear to be a method to search for modules on this website. In fact not all modules are even displaying.
I downloaded one module (data manager) that required the SWFloader module, but that is not anywhere in the modules index. I eventually found it through Google, but can not find any route to it on this website.
You can browse a load of silverstripe modules @ http://open.silverstripe.org/browser/modules/ Some in early dev hence not being listed on http://silverstripe.org/modules/ . The problem is this does not include 3rd party modules like the DOM or SWFuploadfield.
Saying that the SWFuploadfield is listed. You must not have been looking at the unsupported modules @ http://silverstripe.org/modules/prerelease
I'd be surprised if the SWFuploader is not a supported module because the supported Data Object Manager requires it. I only discovered this module existed when I got this error as soon as the Data Object Manager was installed:
Error: DataObjectManager requires the SWFUpload module.