The Commons Jexl library is an implementation of the JSTL Expression Language with extensions.

ASM Commons

Common runtime utilities used by various JAXB and JAX-WS implementations.

EJB3-style annotations for Hibernate - common code

Common reflection code used in support of annotation processing

The Apache Commons Digester package lets you configure an XML to Java object mapping module which triggers certain actions called rules whenever a particular pattern of nested XML elements is recognized.

JSP 2.0 Expression Language Interpreter Implementation

Jelly is a Java and XML based scripting engine. Jelly combines the best ideas from JSTL, Velocity, DVSL, Ant and Cocoon all together in a simple yet powerful scripting engine.

Java 1.8+ Library with tons of utility classes required in all projects

Commons VFS