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.

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

A java tookit for generating and processing Atom messages

Openutils base Spring-Hibernate DAO (for java 5 and more)

java symbolic computing library and mathematical editor