Simple Customer
Simple Customer is an open-source online customer database that allows you to easily manage your clients and customers along with adding notes and tasks & multiple contacts.
More Info 
Developer: johnboyproductions.com
License: GNU General Public License (GPL)
Operating System: All POSIX (Linux/BSD/UNIX-like OSes)
Simple ASP script to publish your pictures into the Internet in the easiest and quickest way possible.
Developer: Ivan Loire
License: GNU General Public License (GPL)
Operating System: Windows
ARSC is an easy to install, simple to handle, cross-browser and cross-platform compatible, high-performance open source web chat system written in PHP, using MySQL.
Developer: Jeff Lynn
License: GNU General Public License (GPL)
Operating System: Not Available
CMS Made Simple is an easy to use content management system for simple stable content sites.
Developer: CMS Made Simple Team
License: GNU General Public License (GPL)
Operating System: Platform Independent
QueWeb focuses specifically on the Customer Care portion of the life cycle, after the Customer has been acquired.
Developer: Queplix Corporation
License: Mozilla Public License (MPL)
Operating System: All POSIX (Linux/BSD/UNIX-like OSes), Solaris, Win2K, WinXP
Simple Free Mass Mailer Sender is a script, that you can use from your server to send mass mails.
Developer: Shan Given
License: GNU General Public License (GPL)
Operating System: Unix
Simple Blog PHP script is easy to put on your website.
Developer: ProfiAnts
License: Common Public License
Operating System: Apache, Linux, UNIX, Win NT, XP
RSS stands for Really Simple Syndication.
Developer: savitha
License: GNU General Public License (GPL)
Operating System: Not Available
WeLive is an open-source, simple-using, advanced, professional Web Online Support (Online Customer Service).
Developer: Weensoft
License: GNU General Public License (GPL)
Operating System: Not Available
Simple Database is a multi-platform compatible script that just reads the values from the table and puts them in an HTML table.
Developer: RF
License: Freeware
Operating System: Unix/Linux/Windows
Simple Content Management with PHP/MySQL is multi-platform compatible.
Developer: Mike VanderMolen
License: Freeware
Operating System: Unix/Linux/Windows
Simple Gallery Script is a multi-platform compatible script that is designed to easily showcase your images on the web.
Developer: sourceforge
License: Freeware
Operating System: Unix/Linux/Windows
PHP MySQL Simple Content Management.
Developer: Mike
License: Freeware
Operating System: Linux, Unix, Windows
A simple content management system based on PHP and the free and fast MySQL database.
Developer: Mike VanderMolen
License: Freeware
Operating System: Unix, Linux, Windows
Simple Authorization Script, or SAS, is a php script which password protects web pages without the use of a database.
Developer: Zann Marketing
License: Freeware
Operating System: All
Simple Picture Gallery Manager is a multi-platform compatible PHP script that can display picture galleries on the web.
Developer: Sylvain Pajot
License: Freeware
Operating System: All
A simple guestbook utlitity that can be easily integrated into your site.
Developer: Andrew R. Freed
License: BSD License
Operating System: All
Simple Machines Forum is all of the above.
Developer: Lewis Media
License: Other Free / Open Source License
Operating System: linux, windows, freebsd, sun
A free open-source content management application released under the GPL
Simple Web Content Management System™ is a complete content managment website.
Developer: Jeff Lynn
License: GNU General Public License (GPL)
Operating System: Apache or IIS web servers with PHP and MySQL
Pheap offers a simple, bold interface that masks a powerful content management system.
Developer: Spencer Akers
License: Freeware
Operating System: ALL