Guava is a suite of core and expanded libraries that include

An ASCII table with various render options and UTF-8 support

APIs for CDI (Contexts and Dependency Injection for Java)

Jakarta Dependency Injection

JUnit Jupiter is the API for writing tests using JUnit 5.

Core classes of Apache Maven to manage the building process.

Model for Maven POM (Project Object Model)

The API for Maven 3 plugins - Mojos - development.

Maven Settings model.

Java annotations to use in Mojos

The application programming interface for the repository system.

An implementation of the repository system.

Weld support for Java SE

Binding/provider for SLF4J, which outputs all events to System.err. Only messages of level INFO and higher are printed.

A TestNG like dataprovider runner for JUnit having a simplified syntax compared to all the existing JUnit4 features.