Maqetta is a web-based WYSIWYG application which focuses on easing the process of creating HTML5 web pages.

The project is open source, does not require any plugins to run and can be used as a hosted service or by installing locally.

Its interface works with drag 'n' drops, there is support for desktop-like functions like undo/redo, preview in browser, save/save as and much more.

This version of Maqetta has the best support for Dojo library and enables you to insert the widgets/controls (like buttons, accordion menus, calendar, etc.) of the library instantly.

The application makes getting feedback for the pages developed easier with the ability to create multiple reviews (for ex: for each version). The developer simply selects the pages to be reviewed and the system automatically sends e-mail invitations to reviewers. And, reviewers can either share their thoughts as text comments and/or on-screen graphical annotations (rectangles, ovals, arrows and text).

Maqetta has much more integrated features like the ability to create wireframes with the help of a sketch theme, mobile authoring tools and more.

For JavaScript and AJAX applications, Taffy DB is a beautiful tool.

Taffy DB is an open source JavaScript library that acts as a data layer inside the applications. Just think of it as a SQL database in your web browser.

Let’s say you have a collection of products and you want to find every product that costs less than $10 and is not a book. Simple, just write some JavaScript:
products.find({price:{lessthan:10},
type:{not:"Book"}});

Major features:

• Under 10K!
• Simple, JavaScript Centric Syntax
• Fast
• Easy to include in any web application
• Compatible with major Ajax libraries: YUI, JQuery, Dojo, Prototype, EXT, etc
• CRUD Interface (Create, Read, Update, Delete)
• Sorting
• Looping
• Advanced Queries

Check out the Getting Started Guide for Taffy DB‘s capabilities.

Creating ajax applications are now much easier with WaveMaker Visual Ajax Studio for both developers and users with even no JavaScript experience.

WaveMaker Visual Ajax Studio is a visual builder that helps ceating web-applications using Ajax widgets, web services and databases. Best of all, it does not require complex codes, forms, patterns or portal frameworks.

Some Features:

• Drag & Drop Assembly
• LiveLayout™
• Push to Deploy™: One-touch application deployment
• Visual Data Binding>
• SOAP, REST and RSS web services
• Leverage existing CSS, HTML and Java
• Deploys a standard Java .war file