Apache NetBeans
Programmer-friendly testing framework for Java and the JVM
ProGuard, Java optimizer and obfuscator
TestNG testing framework
tinylog is a lightweight logging framework for Java, Kotlin, Scala
MyBatis SQL mapper framework for Java
Pure Java annotation, single class file, rapid development
Framework for building GraalVM-enabled command line apps
A scalable web crawler framework for Java
Provides support to increase developer productivity in Java
Simplifies the development of creating a JPA-based data access layer
Cross-platform C++ library for use as a default application framework.
SDL library for Android, including several games.
iDempiere. Community Powered Enterprise
the java game and entertainment runtime
An object relational-mapping (ORM) library for Java
Cross-platform DICOM implementation
Arianne is an engine to develop multiplayer online games like Stendhal
A Java library for parsing and unmarshalling CSV files
Automatic frontend engine for Java
Eclipse 4diac the open source solution for industrial automation