Constructr is a fresh open source CMS application built with PHP & MySQL.

With an Ajaxed backend, this CMS application uses TinyMCE for content editing & supports clean URLs via mod_rewrite.

The admin interface has:

• Backend user & right management
• Asset center for uploads
• Integrated search engine for asset
• Automatic sync after FTP-uploads
• Automatic thumb´s for image-uploads
• Integrated shadowbox-viewer for assets
• Customizable backend language (Available: DE, EN, US, CH, AU)
• Live preview  for hidden pages and content

For the frontend:

• Cache system
• File based templates
• Multilingual frontend support
• Use a frontent that fits your special needs (pure PHP and MySQL, Smarty, Flash …)
• Individual 404 error page
• Automatic RSS 2.0-Feed for every single content

Like mentioned, this free content management system is still fresh but frequently updated & looks promising.

Liferay, with 60 tools and a selection of today’s most innovative technologies, enables you to do everything like:

• Creating websites.
• Building intranets.
• Simply getting the right documents and applications to the right people.

Liferay inlcudes web publishing, content management, collaboration and social networking.

With the role-based authorization, admins & users can define which information can be viewed by which users.

A strong set of community features help creating communities, user groups & they can have their own mini-portals.

Some other included features are: wikis, forums, instant messenger, calendar, webmail, blogs & more.

And, any other applications like accounting, sales can be integrated with its open architecture.

The application is “giant” with the features it offers & hard to describe its capabilities completely. Users interested in creating an enterprise portal should definitely check it.

Concrete5 is a very powerful & open source content management application which has a different approach in how it works.

It enables users to manage websites while browsing it by simply switching to the edit mode (an overlayed screen). This makes anyone who can use a text editing application administer their websites.

The application uses PHP / MySQL & built with OOP.

With a very easy to use interface, new pages can added, updated or deleted.

A simple yet effective user permission/role feature helps creating admins, editors & other types of users.

There is a built-in versioning system which simply saves the old versions of a page & who created/updated it.

The application supports templates / plugins & there is a community getting more active everyday to get support.

To see the beauty of the application, check this demo.

Server2Go is a portable web server environment built to be used in CD-ROMS, memory sticks & similar portable media.

It has almost everything you need to run a web application:

• Apache 1.3.x, 2.0.x and 2.2.x
• PHP 5.2.x with a lot of extensions. Downgrade packages to 4.4.x and 5.0.x available)
• MySQL 5 support
• Perl 5.8 with many CPAN modules integrated

Server2Go auto-configures all the settings that may vary in every environment like ports & proxy settings.

It starts the server environment at the background when the CD-ROM is run & closes it automatically when the browser is closed.

poMMo is an open source maillist manager application for adding a mailing list to your website or to organize stand alone mailings.

poMMo requires PHP & MySQL, offers a very simple web-based setup and it can be ready to use within minutes.

With an Ajaxed interface, you can create custom subscription forms & subscriber groups. After that, it provides you the necessary embed code (or HTML output) for inserting the form.

poMMo is also a smart application as it gets the list of sent-unsent-failed e-mails during the delivery and has an automated “list cleaning” feature by checking the bounced e-mails.

Other nice features of this maillist manager:

• Easy creation of subscriber groups
• Quickly import and export your subscriber base
• WYSIWYG HTML mailing creation
• Flexible collection of subscriber data through user defined “fields”
• Drag and drop field ordering
• Themeable, brandable, multilanguage
• Limit the sending of mails – throttle by hour, bytes, and domain limits
• Revolutionary AJAX based subscriber Management
• Personalize Mailings — e.g. Say “Dear Susan” vs. “Dear Subscriber”
• View and Reload sent mailings from the Mailing History page
• Mailings can be paused, resumed, and canceled “live”
• Mailings take place in the background — you can turn your computer OFF during a sending
• Subscribers can unsubscribe themselves or update their own information (including email address)

This mailing list manager application uses very low disk I/O and can be used for big mailing list groups.

P.S. Admin interface has a small compatibility problem in Firefox.