Constructors
Drupal

A free and open source content-management system and framework written in PHP and using relational database management system as a storage.

Main modules:
Drupal
Php
Mysqld
Postgresql
Nginx
Apache
Joomla

A free and open-source content management system (CMS) for publishing web content, based on on PHP and JavaScript. It is built on a model–view–controller web application framework that can be used independently of the CMS.

Main modules:
Joomla
Php
Mysqld
Postgresql
Nginx
Apache
Oscommerce

A free and open source e-commerce and online store-management software program

Main modules:
Oscommerce
Php
Mysqld
Nginx
Apache
Redmine

A flexible project management web application.

Main modules:
Redmine
Nginx
Apache
Mysqld
Postgresql
Sugarcrm

A free and open-source version of customer relationship management system SugarCRM. It includes sales-force automation, marketing campaigns, customer support, etc.

Main modules:
Sugarcrm
Php
Mysqld
Nginx
Apache
Wordpress

A free and open-source content management system (CMS) based on PHP

Main modules:
Wordpress
Php
Mysqld
Nginx
Apache
Publify

A self hosted Web publishing platform on Rails

Main modules:
Publify
Mysqld
Postgresql
Nginx
Apache
Solidus

Rails eCommerce System, fork of Spree

Main modules:
Solidus
Mysqld
Postgresql
Nginx
Apache
Spree

A complete open source e-commerce solution for Ruby on Rails

Main modules:
Spree
Mysqld
Postgresql
Nginx
Apache
Tracks

Tracks is a GTD web application, built with Ruby on Rails

Main modules:
Tracks
Mysqld
Postgresql
Nginx
Apache