Command Line Parsers
LineArgs is a simple implementation of command line arguments parser based on annotations/metadata. A .NET version with the same API is also available.
Extracting command line options directly into data members: each field marked with an @External annotation automatically becomes a command line option. Extracting the options values from the command line arguments, i.e., the "String args" parameter to main, into the field(s), requires a single method invocation: Introspector.extract(args, o1, o2, ...) where o1,o2, ... are the objects in which the fields annotated with @External.
A Java library to support command-line apps, including daemonization support.
cli-util is an extension of apache common's java command line interface (commons-cli) library. It adds sub commands, more type safely and a declarative style for defining commands, their options, flags and arguments.
Library supporting an implementation of command line interface for Java applications
CLI-Parsec is a declarative CLI-Parser-Framework for Java. It is based on annotations and aims to ease defining and parsing command line interfaces.