Millstone is a user-interface component library designed for Java programmers to be used in web development.
One notable aspect of Millstone is that commercial support is available for this software. Plus, it's in active use by many large enterprise applications and software products, which is a good indicator of its quality. Since the API has been stable since 2002, Millstone is updated regularly to keep pace with the latest browser technologies.
The latest version of Millstone includes many new features for UI components, better integration with different J2EE environments, and an upgraded API required for upcoming AJAX support. Also, this release incorporates three years of experience using Millstone in many large enterprise applications and software products. If that's not enough to pique your interest, the 3.1 series is also compatible with the 3.0 API that was introduced back in 2002.
Version 3.1.0: N/A