4) XML libraries for generating and parsing xml docs. Although XSD
validation support and XSL transforms.
Phobos has a pretty rudimentary XML lib. Tango's been ported to D2,
though. You could try it. https://github.com/SiegeLord/Tango-D2
You should maybe also mention,
https://github.com/adamdruppe/misc-stuff-including-D-programming-language-web-stuff/blob/master/dom.d
and http://opticron.no-ip.org/svn/branches/kxml/
5) networking libs with several main protocol implementations such as
Http, FTP and SMTP.
std.net.curl was just added to the latest Phobos release.
"nazriel" is also working on a "http and other protocols" lib (but in D,
with no curl ...), but I don't know the current state,
https://github.com/nazriel/netd
