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JUnit is a unit testing framework to write and run repeatable automated tests on Java. It provides a robust environment to write, organize, and execute automated tests, ensuring code reliability and repeatability. Its user-friendly annotations and assert methods facilitate the development and running of test cases, making it a foundational tool for Java developers focusing on quality assurance and test-driven development.
Last Release on Feb 13, 2021

Kotlin Standard Library
Last Release on Jan 27, 2025
API for SLF4J (The Simple Logging Facade for Java) which serves as a simple facade or abstraction for various logging frameworks, allowing the end user to plug in the desired logging framework at deployment time.
Last Release on Feb 25, 2025
Kotlin Common Standard Library (legacy, use kotlin-stdlib instead)
Last Release on Jan 27, 2025

Guava is a suite of core and expanded libraries that include utility classes, Google's collections, I/O classes, and much more.
Last Release on Dec 17, 2024
Standard library for the Scala Programming Language
Last Release on Jan 10, 2025

Relocated → org.scala-lang » scala3-library
Kotlin Standard Library JDK 8 extension
Last Release on Jan 27, 2025
Mockito mock objects library core API and implementation
Last Release on Mar 15, 2025
General data-binding functionality for Jackson: works on core streaming API
Last Release on Mar 1, 2025
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 LTS releases: 8, 11, 17 and 21 currently. See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml Please ensure your build environment is up-to-date and kindly report any build issues.
Last Release on Aug 29, 2024