Jadex Rules is a small lightweight rule engine, which currently employs the well-known Rete algorithm for highly efficient rule matching. Jadex rules is therefore similar to other rule engines like JESS and Drools.

Retroweaver is a tool, which converts Java 5 (or 6) compliant class files into Java 1.x compliant class files. The jar file retroweaver.jar contains both the class processor (which may be used at compile time) and the runtime classes.

A stripped to the bones CompletableFuture backport for Java 6+ and Android (API level 14+)

ExpectJ is a Java re-implementation of the venerable TCL Expect utility. It can be used to script interaction with either a process (through stdin / stdout) or a telnet session.

JLine is a java library for reading and editing user input in console applications. It features tab-completion, command history, password masking, customizable keybindings, and pass-through handlers to use to chain to other console applications.

streamsupport-flow is a backport of the new Java 9 (JEP 266) reactive-streams Flow and SubmissionPublisher API for Java 6 to 8 and Android developers

JWebUnit is a Java framework that facilitates creation of acceptance tests for web applications. It evolved from a project where we were using HttpUnit and JUnit to create acceptance tests.

Jmol: an open-source Java viewer for chemical structures in 3D

JAXB 2.0 Schema to Java compiler plugin for adding a copy constructor to schema derived classes.

streamsupport-atomic is a backport of the java.util.concurrent.atomic classes added in Java 8 (Double/Long Accumulator/Adder) for Java 6 / 7 and Android developers