The Mechanize library is used for automating interaction with websites. It automatically stores and sends cookies, follows redirects, can follow links, and submits forms. Form fields can be populated and submitted. Mechanize also keeps track of the sites you have visited as a history.
Firekeeper is an intrusion detection and prevention system for Firefox. It is able to detect, block and warn the user about malicious sites. Firekeeper uses flexible rules similar to Snort ones to describe browser-based attack attempts. Rules can also be used to effectively filter different kinds of unwanted content.
Pandorabots Chat Bot Interface is a learning tool for implementing AJAX to communicate between the browser and a server. The chat bot interface communicates via XML with a free chat bot you create and host at pandorabots.com. The client script controlls a div that records your ongoing conversation. The final product is an embedded chat bot in your Web site.
gwt-hibernate provides the basics to create a web application that uses GWT on the front end and Hibernate on the back end. It provides code generation templates and support classes that allow introspection, data binding, and validation of POJOs in the browser. Data-bound Form and Grid widgets are included.