nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
The DOCTYPE is a required preamble for HTML5 websites.
These websites are related to worldforfree.net in terms of content, traffic and structure
world4free.in
downarchive.com
dl4all.com
freshwap.net
avaxhome.ws
freewarefiles.com
softarchive.net
downtr.net