There is always lots of talk about GPL and non GPL extensions in open source communities. Previously I never gave it to much thought until last week when it affected me very harshly.

GPL & non-GPL
For those of you who dont know what GPL is, it is the General Public License and it is the license Joomla and many other open source projects are released under.  The GPL states that any licensee  "is given permission to modify the work, as well as to copy and redistribute the work or any derivative version. The licensee is allowed to charge a fee for this service, or do this free of charge. This latter point distinguishes the GPL from software licenses that prohibit commercial redistribution. "

Generally speaking I have observed that most non-GPL extensions are encrypted. This means initially to install it you will have to first install a "Loader" to handle the reading and execution of the extension (more overhead). Additionally you can't see the source code to make modifications, learn from the code,  use the code to further advance the project, spurn a new project or self support for problems that arise.

As a member of the editorial team at the Joomla Extension Directory, I see a lot of extensions in the course of a day. Many times these are helpful plugins or modules that make site maintenance a little easier or a little smarter. I love those gems.

But occassionally, an extension comes along that really looks promising and generates a lot of buzz in the Joomlasphere. The recently released social networking application JomSocial is one such extension that has taken the community by storm.

A few moments ago my YooTheme RSS feed refreshed and I was pleasantly surprised to find a new blog post describing some details about their forthcoming extension for which they have been running a clever, teaser-style guerilla-marketing campaign. ZOO, as it is named for the time being, is based on the same concept as the Content Creation Kit (CCK) for Drupal. As in Drupal, the purpose of ZOO is to give Joomla site admins the ability to create new types of content articles with specific features. For example, maybe you would like to add custom fields to a content article. ZOO will allow you to create many different types of content types with unique fields and features.