OpenAuth is an authentication and authorisation product that allows you to manage user and object populations but also manage users, activate and immobilize their accounts, re-send their two factor tokens, check how many times they have tried to log in and more. The second part of OpenAuth is the programming interfaces. There is an authentication module that can be used if you want to implement your own custom authentication, and then there is the authorisation module. The authorisation module is the heart of OpenAuth and allows you to wrap PHP code in conditional functions that will only be executed if the user passes the authentication test.
Membership sign up script. Keep track of members that sign up at your site and organize access to a particular secure directory. Create a sign up service to control access to pictures, videos, sound files, or anything you want. With this script you can create forms to allow people to enter any information and keep track of it all in an administrative area.
Nifty Nerds Web Authentication Suite is a set of scripts in PHP that allow you to set up and implement authentication on a web site using PHP/MySQL and cookie. This is mostly geared towards web developers who would like to skip the coding. But it is a great way to setup a website with user authentication.
PHP-Authentication works like the Tomcat authentication. You give the source to authenticate against (DB, file, XML-RPC, etc.) and the directories/files that shall be protected, and the class handles the rest. No including of any call to a class method on every page is necessary. You can also use it as if it was a standard Auth-class, using a call to "isLoggedIn" on every page that shall be protected.
phpSecurePages is a PHP module to secures pages with a login name and password. It can handle multiple user groups (each with their own viewing rights), store data in a MySQL database or a configuration file, and be used to identify your Web site viewers. It also has multiple language support and session support for both
PHP3 and PHP4.
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mcPass allows you to very easily protect your secret pages (admin, stats, ...) with a login and password form. It's a simple file to copy in the root directory of your site, and two lines of code to paste at the top of each page you want to protect. It requires MySQL.
This script will password protect a file and will also load the html from any text file you want.
Note: this is not the safest way to password protect files. Update: the script will not work if you give it a worng URL to text file. Make sure to use "http://www.yoursite.com/folder/filename.ext" format in the $URL value.