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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

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 Jan 2, 2024
Kotlin Standard Library
Last Release on Apr 9, 2024
Kotlin Common Standard Library (legacy, use kotlin-stdlib instead)
Last Release on Apr 9, 2024

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 Mar 13, 2024
Standard library for the Scala Programming Language
Last Release on Feb 21, 2024

Relocated → org.scala-lang » scala3-library
Mockito mock objects library core API and implementation
Last Release on Mar 1, 2024
Kotlin Standard Library JDK 8 extension
Last Release on Apr 9, 2024
General data-binding functionality for Jackson: works on core streaming API
Last Release on Mar 13, 2024
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.
Last Release on Nov 22, 2023