Main Post: Free and Useful Web Applications

Website Add-Ons:

Advanced Guestbook
Advanced Guestbook is a PHP script that you can use to add a guest book to your Web site.
Free: Yes
Platform: Windows/Linux
Review Rating:
Homepage: http://proxy2.de/scripts.php

Kampyle Feedback
Use Kampyle to: Collect, analyze and manage your website visitor’s feedback. The Kampyle on-demand (SaaS) application combines: Fully customizable feedback forms, Powerful reporting and analysis tools, Easy-to-use feedback management application. Discover how Kampyle lets you leverage valuable customer feedback to improve your website and increase customer satisfaction.
Free: Yes
Review Rating:
Homepage: http://www.kampyle.com/

Network for Good
Network for is a nonprofit organization that helps other nonprofits raise money and reach supporters online. Founded in 2001 by AOL, Cisco and Yahoo!, Network for Good has processed over $250 million in donations for more than 45,000 nonprofits.
Free: Yes
Review Rating: No Rating
Homepage: http://www.networkforgood.org/

PHCDownload
A file content management and manipulation system unlike any other available on the market today, with unique innovations, tools, and design, customizing and producing your database is made easy.
Free: Yes
Platform: Linux
Review Rating:
Homepage: http://www.phpcredo.com/Software/PHCDownload/

phpMyFAQ
phpMyFaq is a multilingual, database-driven FAQ management system that you can use to create and manage a FAQ on your Web site.
Free: Yes
Platform: Linux
Review Rating:
Homepage: http://www.phpmyfaq.de/

phpmyvisites
phpMyVisites is a free and powerful open source (GNU/GPL) software for websites statistics and audience measurements. phpMyVisites gives a lot of information on websites visitors, visited pages, software/hardware utilization, etc… The GUI Interface is fun and practical. Statistics are very complete and use many clear graphics to present data. The web analytics software is translated in more than 30 languages!
Free: Yes
Platform: Linux
Review Rating:
Homepage: http://www.phpmyvisites.us/

WebCalendar
WebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors.
Free: Yes
Platform: Linux
Review Rating:
Homepage: http://www.k5n.us/webcalendar.php

WWW Paint Board
WWW Paint Board (Wpb) is a tool where users can draw dynamically on the web with VML (Vector Markup Language) technology.
Free: Yes
Platform: Linux
Review Rating:
Homepage: http://obiewebsite.sourceforge.net/obie.php?WWW_Pa