XNua is available via an anonymous Subversion server. Obviously your getting the latest version, so may be unstable.
You can browse it via the WWW
To download from a subversion client (I recommand TortoiseSVN) simply checkout with a URL of http://www.xnua.com/svn/xnua
If anybody is fixing bugs or adding features, just send us a mail and I'll give you full read/write access.