TL:DR; Java Mail library.
Java Mail library. This is a small java package that can send and receive emails. Including MIME and attachements.
JavaScript Drop Down Menu is a fully-featured and accessible menu, that provides useable content to all browsers - including screenreaders, search-engines and text-only browsers.
Java charts. Bean , Applet and servlet that will create charts for your web site of java application. It supports more than 18 2D and 3D types of charts and combinations of them. It supports interactive features like zoom , scroll, tips and links.
JTree is a professional Java tree menu applet with XML support, dynamical loading, cross-browser/multiplatform compatibility and powerful client-side API. This component is highly useful for representation of structured data.