Web Development Tools

• SubText
  Subtext is a personal blog publishing platform that focuses on usability, elegance, and simplicity. If you’ve ever caught yourself throwing your hands in the air and declaring that you’re going to write your own blogging engine, then Subtext is for you.

• ASP.NET AJAX (formerly "Atlas") - |
  A client- and server-side framework providing components and infrastructure that allow the creation of highly interactive web applications while hiding the complexities of Ajax and JavaScript portability
  
• Anthem.NET - |
  Provides web form controls with Ajax built right into them; no client-side JavaScript required
  
• Ajax.NET Professional - |
  A lightweight Ajax framework that makes it easy to call server-side methods from client-side code.
  
• UrlRewritingNet.UrlRewrite - |
  An open source library that enables you to rewrite URLs with ASP.NET 2.0
  
• BusyBoxDotNet - |
  An ASP.NET web-control library capable of showing a customizable message during time-consuming activities
  
• CSS Friendly ASP.NET 2.0 Control Adapters - |
  Lets you get better HTML out of your ASP.NET controls, making it easier to style them with CSS
  
• FreeTextBox - |
  An HTML editor web control that lets you easily add word-processor-like functionality to your applications
  
• WebChart - |
  A freely available charting control that, though it might not include all the features of commercial controls, handles creating standard charts in excellent fashion
  
• RSS Toolkit - |
  Includes a plethora of RSS-related features, including an RSS data source, an HTTP handler, and an object model
  
• DotNetNuke - |
  Robust, flexible framework system for developing web applications
  
• Castle MonoRail - |
  Agile MVC framework for web applications
  
• Web Developer Toolbar for Internet Explorer - |
  You think the Web Developer Extension for Firefox is cool? Get the same power in IE.
  
• Web Developer Extension for Firefox - |
  Must-have Firefox extension for web developers. Gives you complete control over the browser, helping you develop and test your pages.
  
• Web Development Helper - |
  An IE plug-in to improve the developer experience for Ajax and rich web applications
  
• Drip - |
  Easy-to-use memory leak detector that keeps track of HTML DOM objects used by IE. Allows you to inspect browser memory usage and detect leaking objects.
  
• DOM Helper - |
  Explorer bar for IE that allows developers to easily identify and correct issues in problem web pages
  
• W3C Markup Validation Service - |
  Advanced markup validation service from the organization responsible for the validation rules. Validates by URL, file upload, or direct markup input.
  
• HTML Titdy - |
  Free open source web (or desktop) tool that will parse your HTML and correct any issues that it encounters