ePortal is an integration of Expresso, Struts and Tiles with an implementation of the Java Portlet Specfication (JSR 168). With this integration the community software including eForum and eContent (a Web content management solution) and other Jcorporate components including ePoll, eFAQ, and eHelpdesk are available in a portal.
jUDO (java Universal Data Objects) speeds up development/maintainence and removes database-vendor dependency for applications using databases. You should use jUDO whenever you don't want to use EJBs. You don't write any database code; you only have to specify the container classes and the interfaces for the models, and then jUDO creates the implementation for you runtime (no source is generated). It derives all info needed from your interfaces method names that follows name-pattern rules. In case you need some special access method, you either add a plugin for this or simply go directly against the database. jUDO is not as configurable and advanced as other much more professional software like Castor, Hibernate, etc., but since jUDO derives the database from your code, there is never a mismatch between code and database.
Log4j is a logging package written in Java. Log4j allows you to log to a file, a java.io.Writer, a remote server, or a syslog daemon. The package is designed so that log statements can remain in shipped code without incurring a high performance cost. One distinctive feature of log4j is the notion of hierarchical loggers. Using hierarchical loggers, it is possible to select (at runtime) which log statements are output at arbitrary granularity. Users can choose to implement their own log formats and output strategies.
log4net is a tool to help the programmer output log statements to a variety of output targets. log4net is a port of the excellent log4j framework to the .NET runtime. log4net runs on the following frameworks: Microsoft .Net Framework 1.0, Microsoft .Net Framework 1.1, Microsoft .Net Compact Framework 1.0, Mono 0.23, Microsoft Shared Source CLI 1.0.