Args4j is a small Java class library that makes it easy to parse command line options/arguments

Core Jackson processing abstractions (aka Streaming API), implementation for JSON

General data-binding functionality for Jackson: works on core streaming API

Guava is a suite of core and expanded libraries that include

Guice is a lightweight dependency injection framework for Java 8 and above, developed by Google.

The Java-based Simple Argument Parser.

Smack core components.

Smack for standard XMPP connections over TCP.

Binding/provider for SLF4J, which outputs all events to System.err. Only messages of level INFO and higher are printed.

Simple Java client to talk to RESTful backends

JUnit Jupiter is the API for writing tests using JUnit 5.