PUBLIC MARKS with tags support & php

"Web Messenger" - is unique software allowing visitors of your site to chat with your operators.

Open source FAQ system for PHP and MySQL, PostgreSQL and other databases

osTicket is a widely-used open source support ticket system. Plain and simple it is a lightweight feature packed support ticket tool written mainly using PHP scripting language. An attractive alternative to higher-cost and more complex customer support systems; simple, lightweight and easy to setup and use. The best part is, it's completely free.