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 commons-lang.

The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported ...

The Apache Commons Codec component contains encoders and decoders for formats such as Base16, Base32, Base64, digest, and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a ...

Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.

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

Types that extend and augment the Java Collections Framework.

Apache Commons BeanUtils provides an easy-to-use but flexible wrapper around reflection and introspection.

Apache Commons CLI provides a simple API for presenting, processing, and validating a Command Line Interface.

The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.