Mr. Persister aims at providing a simple yet complete relational persistence API. Current features include easier JDBC operations via JDBC templates (Spring style), automatic connection/transaction handling, object relational mapping, dynamic report support, connection pooling, and more. Planned features include replication, JDBC driver debugging, more advanced ORM, and more.
JSP Prize Tags is a JSP tag library. The primary tags are the Tree Tag, Tabbed Pane Tag, and AJAX Tags. The Tree Tag makes it easy to implement tree controls in your JSP pages. The Tabbed Pane Tag makes it easy to implement tabbed panes in your JSP pages. You can put any JSP code inside a tab, and even include other JSPs inside a tab. The AJAX Tags make it easy to turn your links and forms into AJAX links and forms, which reload in a table cell or div tag instead of the whole page. Also included are the icon tag, the alternate tag (for alternating content on the page, such as the background color of table rows or an ad rotator), laying calendar events in a table, and more.
Butterfly Container is a Java dependency injection container. It is smaller (~100KB jar), yet more flexible and easier to use than Spring, Pico, and Guice (at least in the developers' opinion). Instead of XML, Butterfly Container is configured using a simple, flexible, Java-like configuration language, or by plugging plain non-annotation, non-reflection Java factories into the container. There are no external dependencies.
Butterfly Persistence is a simple, no nonsense Java persistence API. It aims to provide a simple relational persistence API. Its features include automatic/manual connection management, easier JDBC operations via JDBC templates (Spring style), simple object relational mapping, and map reading for dynamic queries. It provides a simple and pragmatic approach to persistence and will either help you, or get out of the way and let you do the job manually.
Butterfly Web UI is a component based Java Web application framework. Like the rest of the Butterfly Components, Butterfly Web UI is extremely small and very flexible. Butterfly Web UI uses Butterfly Container internally, a state of the art dependency injection container. Using Butterfly Web UI, it is easy both to generate HTML for a Web browser or XML or JSON for a RIA frontend (Flex, JavaFX, Silverlight) or AJAX frontend. You also can easily create HTML layout templates that are reused throughout your Web application, so you don't have the layout hardcoded into every page. You can easily mix RIA and non-RIA Web application technology in the same Web application.