PHPMailList is a powerful, yet simple to use, email announcement script. It allows people to subscribe/unsubscribe through a web-based form, and includes email address validation function.
The web-based administration module allows the owner to send messages to the list, subscribe/unsubscribe people, view the list of subscribers, and configure the script.
Installation is simple, and configuration of confirmation messages, welcome messages and goodbye messages, as well as signatures are all maintained through the password protected administration section.
Keeps track of the hits in and hits out of all referers to your site. Everything is automated, all you do is set it up and let it run. The list is automatically cut after x days, you can block x amount of domains from being included and includes spam protection.
phpOpenTracker is a comprehensive solution for your site- and visitor-tracking needs. The collected data is stored in a SQL database, allowing complex, yet easy analysis. A powerful API for analysis and report generation (HTML or PDF output) is included. phpOpenTracker requires PHPLIB 7.2c or higher, and supports mSQL, MS SQL, MySQL, Oracle / OCI8, ODBC, PostgreSQL, and Sybase.
Chatty :) is a very nice script that lets you create a simple but very-good looking chat in a few minutes. Distributed under GPL and written entirely in PHP, it is highly customizable and fully open to modifications.
It requires MySQL as a backend RDBMS.