Hibernate is designed to be flexible in terms of  table schema used, to adapt to use on an existing database. It also has the functionality to create the database from available information.

Hibernate offers a query language data called HQL (Hibernate Query Language), at the same time to build an API queries programmatically (known as “criteria”).

Hibernate for Java can be used in applications Independent Java applications or Java EE, by the component that implements the Hibernate Annotations JPA standard, which is part of this platform.

An interesting point is connecting Hibernate and Liferay. More info about this experience soon!!

Official site: http://www.hibernate.org/

ICEfaces is a fully featured product that enterprise developers can use to develop new or existing Java EE Ajax applications at no cost. There is an open source project and an Enterprise (commercial) software that extends the open source project.

There are numerous benefits of using ICEfaces to enrich enterprise web applications:

Rich User Experience: Create a superior user experience and produce more effective enterprise Java EE Ajax applications.

Open Source: ICEfaces is the most successful enterprise Ajax Java framework available under open source.

Standards-based: ICEfaces is a pure Java enterprise solution so developers can continue to work the way they are use to. Existing Java IDEs and test tools can be leveraged during development.

Easy Ajax: ICEfaces is much more than a component suite it is a Java Ajax application framework that provides ease of development for Java/JSF developers. ICEfaces applications are developed with minimal design effort in Java/JSF not JavaScript.

Ajax Push: ICEfaces pioneeredAjax Push , enabling server/application initiated content rendering to the browser. WithAjax Push , developers can create collaborative and dynamic Java EE Ajax applications like never before. There is simply no easier way to develop JavaAjax Push applications.

Security: ICEfaces EE is the most secure Java EE Ajax solution on the market today. It is compatible with SSL, prevents cross-site scripting, malicious code injections and unauthorized data mining. As a server-based solution, ICEfaces EE doesn’t expose application logic or user data, plus it is especially effective at preventing fake form submissions and SQL injections attacks.

Project Home page:

http://www.icefaces.org

Velocity is a Java-based template engine.  As we use Velocity for web development, web designers can work in parallel with Java programmers to develop web sites according to the Model-View-Controller (MVC) model. That means that web page designers can focus wholly on creating a site with an awesome, and programmers can focus solely on writing code.
Velocity separates Java code from the web pages, making the web site more maintainable over its lifespan and providing a viable alternative to Java Server Pages (JSPs) or PHP .

But Velocity’s capabilities reach well beyond the realm of the web; for example, it can be used to generate SQL, PostScript and XML from templates. It can be used either as a standalone utility for generating source code and reports, or as an integrated component of other systems. For instance, Velocity provides template services for the Turbine web application framework, together resulting in a view engine facilitating development of web applications according to a true MVC model.

Here are some links:
Apache Velocity Project
Velocity on the Wikipedia