Vaadin is a Java framework for building modern web applications that look greata and perform well. The core software is free and open source. Programmers can simply work with pure Java code and do not worry about technologies such as JavaScript, HTML and Ajax while coding. Vaadin is a server-centric architecture; that means most logic is processed on the server side.
A dashboard demo is available here.

Vaadin website: vaadin.com. You can also find it on GitHub.

Data Ninja just published on Codecanyon a very interesting collaborative platform for dashboard creation and sharing. Some features:

• Multi tenant – users can set up private account with secure login and password
• Collaboration functionality – invite others by email to collaborate on charts and dashboards
• “My Dashboards” panel – displays all dashboards you develop and maintain and those that you are collaborating on
• Brand new enhanced menu that has thumbnail display of collaborators

More informations available here. The product demo is here.
You can start to build your own dashboard.