Keep it fast, simple and free. ASPajax is the definitive Ajax framework for Classic ASP (VBScript) websites. All you need is a W3C compliant ASP website and a few lines of code.
If you're looking for an easy to use yet extremely powerful Ajax chat solution, then ASP.NET Ajax Chat may be just what you're looking for. The software is simple to install, fast and customizable. It uses AJAX to smoothly refresh (no flicker).
Ajax-Controls.NET component is designed to provide developers with an easy-to-use tool to AJAX enable standard ASP.NET controls and 3rd party controls in ASP.NET application, which allow you to update page content without postback and loss of scroll
Ajax Uploader is an easy to use, hi-performance ASP.NET upload component which allows you to upload files to web server without refreshing the page. It supports ASP.NET AJAX frameworks and works in ajax updatepanel.
ARI is a free .NET Ajax programming library that removes all the complexity associated with developing Ajax enabled web sites. ARI allows you to execute methods in the App_Code directory of your ASP.NET web site using an extremely simple call syntax.
Virto Custom List Form Extender is Ajax and Java Script based Web Part allowing for quick and simple customizing SharePoint list forms for creating, editing and viewing list items.
Virto Ajax Mini Calendar is intended to show all the events from different data sources in one small single calendar. Easily connected to Virto Calendar.
Put your MySQL Database on the Web/Intranet in minutes without writing a single line of code. APCGP generates Richly-Featured Ajax Data Entry Web Applications in highly readable and extensible object-oriented PHP leveraging top open-source libraries