SiteNet BBS makes it possible to add a full set of professional and attractive forums to your Web site with ease. Fast, customizable, unlimited forums, moderation, upload of user images, user profiles, emoticons, e-mail notification, and many other features are included, along with extensive admin and moderator admin panels for managing all aspects of your forums. Also included is a special setup interface to ensure easy installation.
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.