Immutables allows you to embrace immutablity to tackle complexity and concurrency challenges. To get the benefits of immutability in Java, there's an annotation processor to easily create simple and consistent value objects. You can think of it as Guava's Immutable Collections but for regular objects. It includes support for JSON marshaling, MongoDB repositories, and JAX-RS.
WebAnno is a general purpose Web-based annotation tool for a wide range of linguistic annotations. It offers annotation project management, freely configurable tagsets, and the management of users in different roles. It uses technology from the brat rapid annotation tool for visualizing and editing annotations in a Web browser. It supports annotation and visualization of arbitrarily large documents, pluggable import/export filters, the curation of annotations across various users, and farming out annotations to a crowdsourcing platform.
hyphenType is a commandline interface for Java. It turns raw arguments into Java objects, organizes return codes to the operating system, stops exceptions from going to the console, has beautiful --help, supports internationalization, handles input channels, and offers advanced unit testing. Additionally, hyphenType provides a tool to dynamically edit Java annotations and to load annotation properties from property files.
CarrotGarden SCR provides an OSGI Service-Component descriptor generator according to a proposal described in RFC 0172 Declarative Services Annotations. It is comprised of annotations, a Maven plugin, and an Eclipse connector, and allows for interactive SCR component descriptor updates in Eclipse, which are compatible with non-interactive Jenkins Maven builds.
CRest (Client REST) is a lightweight library that simplifies the integration of third party RESTful services into Java applications. CRest is mainly annotation-driven, allowing the developer to focus on the essential aspects of the integration of a REST service, such as the definition of the Java interface that maps the remote REST methods and the data model the interface will deal with. The rest is achieved by annotating a plain Java interface with the relevant information such as the service end-point, the desired timeouts, URL formats, etc. CRest will handle everything else, including HTTP request generation, auto marshalling of the response, and more.