Atlassian Confluence - Commercial Wiki and knowledge management system using WebWork 2.0, Hibernate, Spring, and Velocity
Jive Software - With over 1100 customers, Jive Software's Forums and Knowledge Base products both use WebWork 2.1+ and are some of the largest deployments of WebWork
Midwinter - an open source rapid web application develop system using WebWork 2.0, Hibernate, Spring, and Velocity
TeraMEDICA - WebWork is used in TeraMEDICA's commercial TI2m product, which performs intelligent image management for the healthcare enterprise. Specifically, WebWork is a key component of the system's management interface.
EBIA COBRA and 401K Benefits Site provides law reviews for employee benefits like COBRA and 401K. The site moved from all struts to a current architecture of about 50% WebWork and 50% Struts. We are trying to move it all over to WebWork. This site is also a great example of porting from Tiles to SiteMesh.
Valtira Rolecall - Identity Management Framework that provides single sign-on for J2EE and .NET web applications.
JavaEye Reporting Tool - An open-source, web-based database reporting tool. It allows you to create reports without any programming (though you'll need SQL knowledge). It's a lightweight reporting environment, the report can be created to quickly share information via web.
Dating-site - Commercial dating site (BE, dutch) ww2.1.7, hibernate
Agility Issue and Bug Tracker - Bug tracking software that makes heavy use of WW's Ajax Framework. Take a look at the dashboard for great examples of what can be done with WW.
JavaBB - phpBB like forum system. Written and used at Javafree brazillian community.
CRI - A pharmecutical marketing compliance application.
Logicd.com - A logistics, shipping management, tracking, supply-chain management application.
Green Array - Green Array empowers managers at every level, in every organization. Green Array's web-hosted software solution is a simple, fast, scalable way to improve visibility, collaboration and to accelerate team performance. Integrated SWT client and WebWork 2.2 html dashboard with Hibernate persistence.
Medihome Journal - A dutch/french site with free medical streaming videos.