This page has a list of free or really cheap tools that many in the web design world will find very useful. I will be expanding this list as new items come to my attention.
AWStats is a free powerful and featureful server logfile analyzer that shows you all your Web/Mail/FTP statistics including visits, unique visitors, pages, hits, rush hours, os, browsers, search engines, keywords, robots visits, broken links and more...
Apache has been the most popular web server on the Internet since April of 1996. Apache is an open-source HTTP server for modern operating systems including UNIX and Windows NT.
phpBB is a high powered, fully scalable, and highly customisable open-source bulletin board package. phpBB has a user-friendly interface, simple and straightforward administration panel, and helpful FAQ. Based on the powerful PHP server language and your choice of MySQL, MS-SQL, PostgreSQL or Access/ODBC database servers, phpBB is the ideal free community solution for all web sites.
mvnForum is an open source, powerful, easy to use, easy to setup bulletin board (forum) built on the Java J2EE technology (Jsp/Servlet).
Discussion Forum Software (CGI Based)
PHP Home page: http://www.php.net
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.
phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.
The MySQL database server is the world's most popular open source database. With more than five million active installations, MySQL has quickly become the core of many high-volume, business-critical applications.
Another free open source database that is very powerful. It is not as popular as MySQL because for years it only ran on Unix systems. Now with the help of a product called CYGWIN you can install and run PostGresSQL on Windows.
The GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
Because of the original Linux license, any flavor of Linux has to be free! People like Red Hat try to hide the free version, but if you dig you will find it on their site for download. Because it is so big, you might just want to buy it since it's really very cheap.