The Apache Commons FileUpload component provides a simple yet flexible means of adding support for multipart file upload functionality to servlets and web applications.

Commons Database Connection Pooling

Commons Logging is a thin adapter allowing configurable bridging to other, well known logging systems.

Alternate implementations of JDK's "Math" functions.

The Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.

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

The Apache Commons Discovery component is about discovering, or finding, implementations for pluggable interfaces.

EJB3-style annotations for Hibernate - common code

Collection of reusable (not depending on any other KIE Soup module) components for KIE Soup.

Commons VFS