Atrise HTML
Lock is a useful tool for webmasters who want to create a
password-protected web page or hide the source code from would-be hackers.

Using the handy dandy wizard, you select the desired option
and, presto!, your page is protected.

The password-protected pages created are not very colorful or
attractive (you've got your basic black and blue), but you can easily tweak
the code to dress it up. While it's hard to make sites completely
hacker-proof, the password-protection scheme of HTML
Lock seems to be pretty secure.
The developers state that the "Hide Source Code"
option is not that secure, but it looks OK to me for basic coverage. If it's
not that secure, then I am not exactly sure why the option was included. In
any event, if someone tries to View Source when it has been protected by HTML
Lock, it won't be very easily read.
To that end, this is a simply and useful utility and may help
you in your web development efforts. More info is here.