Commons-IO contains utility classes, stream implementations, file filters, and endian classes.

Apache Commons JEXL is a library that enables scripting features in Java applications and frameworks..

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

Alternate implementations of JDK's "Math" functions.

Apache Commons Email provides an API for sending email, simplifying the JavaMail API.

Apache Commons VFS is a Virtual File System library.

Apache Commons Exec is a library that reliably executes external processes from within the JVM.

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.

For testing XWiki Components

The Apache Commons 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 ...