Password Gate is a free service and is basically a system where you can easily set up a members area on any site even if you can't run server side scripting. You can secure pages and even have an registrations form for members to register to get access. There are no member limits, and the admin interface is easy to use. Lots more features coming soon.
Created password protected members sections on your website, with unlimited users, and an optional unique login page for each member. Optional and secure sign-up form allows users to add themselves to your member database (if enabled). Several different methods of accessing the members section, including an online login form, or a basic auth popup window. Also offered is optional code to increase page security.
iPasswd is an online password generation tool for .htpasswd files. These files store a username and password combination (one per line of the file) which is used with .htaccess Basic Authentiication. iPasswd also supports MD5 passwords, used in Digest Authentication.