couple of years ago we need to make payment for licensing of any software which we use for website development, whether it is website builder, individual CMS or server, one has to go through legal process of licensing by buying software.

With use of open source technology, you can reduce the cost of licensing as it is available free. PHP, Joomla. Drupal, WOrdpresss, Blogger are some of the popular open source platform for developing static and dynamic website and Oscommerce, OpenCart are some popular CMS for developing ecommerce website.  SO when you are developing large dynamic websites, prefer to stydy features of open source development platform and see if it is able to fulfill necessary information before going for premium software which require paying for its license.