TinyIB is a lightweight PHP image board which emulates the functionality of 4chan. If you use MySQL or SQLite, you can use it to create an efficient setup able to handle large amounts of traffic. If you don't use a database, it can store posts as text files for a portable setup capable of running on virtually any PHP host.
Joomla contact form builder extension is a complicated tool for making submission forms for your Joomla website. It permits you to specify parameters like colors and fonts. It can use a Google map when given an address or geographical coordinates (longitude and latitude), and the user can drag the marker to the required location.
WordPress FAQ is a cool plugin for creating your FAQ section . It has a lot of parameters to set, and it will allow you set your own theme from scratch. It has a user-friendly front-end and back-end interface, allowing you to set all parameters quickly and easily. FAQs have SEO-friendly URLs.
PHP Script Register, Login Users registers and logs users into a website, and shows the online users. It has options to log in with Facebook or with a Google account. It includes a "Remember" button which gives the ability to automatically log in the user on the next visit. If the user forgets the password, the script can send it by email. Each user has a personal page which contains an image uploaded by the user, the registration date, the last visit date, the number of visits/logins, and other personal data (name, pronoun, birthday, personal website, occupation, and hobby). On the personal page, the user can modify the password and the email address added to registration, then he/she will receive an email message with the new data. The script displays the total number of users, the last registered user, and the online users.