PrimeFaces is an open source library for Java Server Faces Web framework. Main goal of PrimeFaces is to create a component suite containing a rich set of components and provide non-rendering JSF extensions to ease development with JSF. PrimeFaces has three modules each focusing on different aspects of JSF.

Using Mojarra, you can get the most complete, up-to-date and well-tested JSF implementation available. JavaServer(TM) Faces technology simplifies building user interfaces for JavaServer applications. Developers of various skill levels can quickly build web applications by: assembling reusable UI components in a page; connecting these components to an application data source; and wiring client-generated events to server-side event handlers.

JSFUnit is a test framework for JSF applications. It is designed to allow complete integration testing and unit testing of JSF applications using a simplified API. JSFUnit tests run inside the container, which provides the developer full access to managed beans, the FacesContext, EL Expressions, and the internal JSF component tree. At the same time, you also have access to parsed HTML output of each client request.

Shale is a modern web application framework, fundamentally based on JavaServer Faces. Architecturally, Shale is a set of loosely coupled services that can be combined as needed to meet particular application requirements. Shale provides additional functionality such as application event callbacks, dialogs with conversation-scoped state, a view technology called Clay, annotation-based functionality to reduce configuration requirements and support for remoting. Shale also provides integration links for other frameworks, to ease development when combinations of technologies are required.

RichFaces is a rich component library for JSF and an advanced framework for easily integrating AJAX capabilities into business application development. RichFaces differs from other AJAX approaches by enabling page-oriented AJAX support instead of the traditional component-oriented support. This means you can define an event in the page that invokes a particular AJAX request and then you can also define those areas of the page that need to be synchronized with the JSF Component Tree after this particular AJAX request is processed on the server.

OpenFaces is a JSF library that provides an extended set of AJAX-powered JSF components, an Ajax framework and validation framework that shifts the traditional JSF validation to the client side. The component suite of OpenFaces includes both visual and auxiliary non-visual components that give you more control over your Web application usability.

JSF Flex goal is to provide users capability in creating standard Flex components as JSF components. So users would create the components as normal JSF components and the project will create the necessary MXML, SWC, SWF files and etcetera and link the values of the components back to the managed beans using JSON+Javascript and Actionscript. {standard Flex components have been open sourced through MPL license}. Also MXML_BASIC renderKitId allows utilizing other renderKits within the same view {i.e. HTML_BASIC}, allowing mix of JSF Flex components and other components such as standard HTML components.

Apache MyFaces is a project of the Apache Software Foundation, and hosts several sub-projects relating to the JavaServer(tm) technology.

While JavaServer Faces and JSP are meant to be aligned,Facelets steps outside of the JSP spec and provides a highly performant, JSF-centric view technology. Anyone who has created a JSP page will be able to do the same with Facelets. The difference is under the hood where all the burden of the JSP Vendor API is removed to more greatly enhance JSF performance and provide easy plug-and-go development. Even though Facelets is being developed open source under Sun's guidance, it can work with any JSF 1.2 compliant implementation or MyFaces.

WebGalileo Faces is a set of highly customizable reusable Open Source user interface Java Web Components for Rich Internet Applications. With full support for the Sun Java Server Faces specification, AJAX, WebGalileo Faces provides developers with the tools needed to easily capture and respond to UI events in the browser. Using the components developers can concentrate their efforts on the business logic of an application and not the details of client side user interface elements.