Free Web Hosting allows you to host your website in the internet for free so that it can be accessed from anywhere in the world. The following list are some of the free hosting sites which I came across and which I have used. Most of the free hosting comes with a sub domain (yoursite.hostingsite.com) or a directory (www.hostingsite.com/ yoursite). I dont think you could find free top level domains. If you know of any please do let me know..
Freehostia
000webhost
Free-HostIn
Mister.net
AdwardSpace
250Free
Site Palace