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Apache.org has 83 URLs listed in 76 Dmoz categories.

Log4j
Logging package for printing log output to different local and remote destinations. Selection and filtering of log events at runtime. [Open Source, APL]
http://logging.apache.org/log4j/
Top/Computers/Programming/Languages/Java/Class_Libraries/Logging

AltRMI
An alternative to RMI which does not require the use of java.rmi.Remote and uses an unchecked substitute for RemoteException, so that "throws RemoteException" is no longer needed. [Open Source, BSD-like]
http://incubator.apache.org/projects/altrmi/
Top/Computers/Programming/Languages/Java/Class_Libraries/Networking_and_Distributed_Computing

Apache SOAP
Implementation of the SOAP protocol - a lightweight protocol for exchanging information, based on XML. HTTP and SMTP (i.e. email) transmission are both supported. [Open Source, BSD-like]
http://ws.apache.org/soap/
Top/Computers/Programming/Languages/Java/Class_Libraries/Networking_and_Distributed_Computing

Jakarta ORO
A set of text-processing classes that provide Perl5 compatible regular expressions, AWK-like regular expressions, glob expressions, and utility classes for performing substitutions, splits, and filtering filenames. This library is the open source success
http://jakarta.apache.org/oro/
Top/Computers/Programming/Languages/Java/Class_Libraries/Text_Processing

The Apache DB Project
Project charged with the creation and maintenance of commercial-quality, open-source, database solutions. Mailing list signup, guidelines, repositories, and proposals.
http://db.apache.org/
Top/Computers/Programming/Languages/Java/Databases_and_Persistence

Apache ObJectRelationalBridge - OJB
A framework that provides transparent persistence of Java objects for JDBC-compliant RDBMS. Implements ODMG 3.0, JDO and uses XML-based O/R Mapping. [Open Source, LGPL]
http://db.apache.org/ojb/
Top/Computers/Programming/Languages/Java/Databases_and_Persistence/Object_Persistence

Torque
An XML-based persistence layer. Part of the Apache Jakarta family. [Open Source, BSD-like]
http://db.apache.org/torque/
Top/Computers/Programming/Languages/Java/Databases_and_Persistence/Object_Persistence

iBatis
XML-based Object/Relational mapping and persistence framework as well as a data access abstraction layer. [Open source]
http://ibatis.apache.org/
Top/Computers/Programming/Languages/Java/Databases_and_Persistence/Object_Persistence

Cayenne
An Object-Relational mapping framework working with relational databases. [Open Source]
http://cayenne.apache.org/
Top/Computers/Programming/Languages/Java/Databases_and_Persistence/Object_Persistence

Bean Scripting Framework
Architecture for incorporating scripting into Java applications, applets and servlets. [Open Source, IBM Public License]
http://jakarta.apache.org/bsf/
Top/Computers/Programming/Languages/Java/Development_Tools