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.

The Maven Jlex Plugin is a plugin that runs the Jlex Java Lexical Analyzer Generator for the specified project.

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.

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

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