A tool for designers to create custom block types, thus making it easy for users to edit visually complex content.
Releasing a new book roughly once a year, writing a weekly column and starting to podcast Ralph Nader's website had reached the limits of its Wordpress underpinings. Concrete5 was chosen because it was easy to build a responsive theme and pull in RSS feeds from multiple sources.
A responsive theme could have been slapped onto the existing Wordpress site and plug-ins for new features could have been installed but that approach tends to bring in a lot of confusing spagetti code that makes further customization as safe as a car without seatbelts.
Concrete5 allowed me to quickly build a site that is easy to maintain and can safely scale to handle unexpected traffic spikes.