The ASF is made up of over 100 top level projects that cover a wide range of technologies. Chances are if you are looking for a rewarding experience in Open Source, you are going to find it here.
Apache Roller is a full-featured, multi-user and group blog server suitable for blog sites large and small.
Apache Roller is a full-featured, multi-user and group-blog server suitable for blog sites large and small. It runs as a Java web application that should be able to run on most any Java EE server and relational database. Roller's installation guide covers deployment on Tomcat, GlassFish, and JBoss application servers using a MySQL, Derby, or PostgreSQL database. Users however have reported success running Roller on other app servers and databases. - Multi-user blogging: can support tens of thousands of users and blogs - Group blogging with three permisson levels (editor, author and limited) - Support for comment moderation and comment...
Apache Tiles™ is a templating framework built to simplify the development of web application user interfaces.
Apache Tiles™ is a templating framework built to simplify the development of web application user interfaces. Tiles allows authors to define page fragments which can be assembled into a complete page at runtime. These fragments, or tiles, can be used as simple includes in order to reduce the duplication of common page elements or embedded within other tiles to develop a series of reusable templates. These templates streamline the development of a consistent look and feel across an entire application.
Object Graph Navigation Library
The Apache Commons OGNL library is a Java development framework for Object-Graph Navigation Language, plus other extras such as list projection and selection and lambda expressions.