1. Joomla – One of the most popular, free and open source Content Management Systems (CMS) on the web today, Joomla is believed to power the content of nearly 2.7 percent websites on the Internet. Joomla's strongest features are its user-friendly applications and plenty of firepower. Joomla is written in PHP. A little-known fact is that Joomla is actually the anglicised version of a Swahili word 'jumla' which roughly translates into "all together".
2. Drupal – Like Joomla, Drupal is also an open source Content Management System that powers countless websites and applications on the World Wide Web. It is popular with those designing personal blogs and government and corporate websites. Thanks to its many add-on modules, it is now easy to design one's dream website using Drupal.
3. Magento – An open source ecommerce web application, Magento is primarily used by those who wish to create a successful online 'shop'. Magento's nifty tools help a prospective entrepreneur to monitor users, carts, payments and the like on his website.
4. OSCommerce – For store owners, developers, service providers, OSCommerce has been a boon. It is one of the most in-demand open source online shop e-commerce solution on the internet today, attracting thousands and thousands of enterprising businesses all over the World Wide web.
5. WordPress – Extremely popular with bloggers, WordPress is an open source blog tool and publishing platform. Basically it is a software that helps one to create an architecturally-satisfying blog or website.
6. Moodle – Moodle is basically a free open source web application that is employed by those in the field of education to create effective online learning sites. Moodle is also known as Course Management System (CMS), a Learning Management System (LMS) or a Virtual Learning Environment (VLE).
7. Ecommerce – As the name suggests, Ecommerce or Electronic Commerce is nothing but the buying and selling of various products and services over the internet. However, today, ecommerce isn't just that. The term covers the entire gamut of business transaction online – right from developing, and marketing to selling and paying for products and services purchased.
8. LAMP / WAMP
LAMP is actually an acronym for a whole bundle of free, open source software. The term LAMP comprises of the first letters of Linux (operating system), Apache HTTP Server, MySQL (database software) and Perl/PHP/Python, all four of which are the main tools required to build a web server.
WAMP is similar to LAMP except that the former has been designed exclusively as a package of independently-created programs to be installed only on those computers that use a Microsoft Windows operating system.
9. ROR / SVN / CVS
ROR is the acronym for Ruby on Rails, an open source web application framework for the Ruby programming language.
SVN - According to Wikipedia, Apache Subversion (better known by its abbreviated version SVN), is a software versioning and a revision control system founded and sponsored in 2000 by CollabNet Inc. Developers use Subversion to maintain current and historical versions of files such as source code, web pages, and documentation.
CVS - The Concurrent Versions System (CVS), also known as the Concurrent Versioning System, is a version control system. This client-server free software revision control system is an important component of Source Configuration Management (SCM) in the field of software development.
10. Zend Framework – Zend Framework is an open source object-oriented web application framework. It is implemented in PHP 5.
11. Symfony Framework – Symfony Framework has been defined as a web application framework that is written in PHP and which follows the model-view-controller (MVC) paradigm
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