RE: Using Vaadin for developing portlets - Forums - Liferay
Use Vaadin with eXo Platform and Build Stunning Web Applications | Intranet
How to create new theme in Vaadin Project – Eclipse Mars?
Introduction on Vaadin framework + Architecture Diagram + History
GitHub - vaadin/platform: Vaadin platform 10+ is a Java web development platform based on Vaadin web components. If you don't know to which repository your bug report should be filed, use this