JOOMLA
Joomla is an award-winning Content Management System (CMS) that will assist you build websites and other influential online applications. Joomla is an open source solution that is freely accessible to everybody.Joomla is used all over the world to power everything from simple, personal homepages to complex corporate web applications.
Joomla is a free, open source content management system for publishing content on the World Wide Web and intranets. The system includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, Blogs, polls, website searching, and language internationalization.
Joomla does a great work of managing the content needed to make your website croon. But for many people, the true power of Joomla lies in the application framework that makes it possible for thousands of developers around the world to create powerful add-ons and extensions.
WORD PRESS
Word Press is a state-of-the-art semantic own publishing platform with a focus on aesthetics, web standards, and usability. Word Press is both free and priceless at the same time.
Word Press is what you use when you want to work with your blogging software, not fight it.
Word Press supports one web log per installation, though multiple concurrent copies may be run from different directories if configured to use separate database tables. Word Press is also in part developed by its community, among which are the Word press testers, a group of people that volunteer time and effort to testing each release.
PHPBB
PhpBB- phpBB has become the most widely used Open Source forum solution. PhpBB has an easy to use administration panel and a user friendly installation process, which allows you to have a forum set up in minutes.
With a large and highly customizable set of key features coupled with a standards compliant interface, phpBB will grow with, compliment your website. With millions of installations worldwide, it is no wonder phpBB is one of the most popular ways to create and support a community.
OS-COMMERCE
OS-Commerce is a great open source application for building your online store. While it looks great out of the box, you'll probably want to change it so that it reflects your store's personality, so customers will remember it and keep coming back.
OsCommerce is an extremely flexible and powerful plug-in shopping cart, catalog, and administration machine all rolled into one. It is open source and therefore is available for private or commercial use free of charge under the GNU Public License, is widely used and supported, and is part of an extremely large online community. It consists of a catalogue front-end, which can be used in conjunction with your existing site, or as a stand-alone site in its own right; and an extremely easy to use administrative back-end interface.
There is no doubt that osCommerce is an excellent solution for anyone looking to implement an online store with the minimum of expense and hassle; it is ready to go almost immediately after installation. All you need to do is add your products using the back-end administration tool, and add some of your store's personal information (such its business address, policies and delivery details). If you're happy with the layout and color scheme, that's almost it. Go live, make money.
ZEND CART
Zend Cart truly is the art of e-commerce; free, user-friendly, open source shopping cart software. The ecommerce web site design program is being developed by group of like-minded shop owners, programmers, designers, and consultants that think ecommerce web design could be and should be done differently.
A few shopping cart solutions seems to be complicated programming exercises instead of responding to users' needs, Zend Cart puts the merchants and shoppers requirements first. Similarly, other shopping cart software programs are nearly impossible to install and use without an IT degree, Zend Cart can be installed and set-up by anyone with the most basic web site building and computer skills.