Nothing to fancy, basically when an user comes to the website, he/she can choose to register. After that he or she can login. The only benefit of logging in is that the user can view pages that were hidden for non-registered users.
A feature such as CAPTCHA isn't necessary, it doesn't need many features, I want to keep it simple. Preferable PHP for the server side language that the application (or script) is using.
Examples or links to pages with pre-made scripts that you can modify are welcome
Thanks in advance!