CPAINT (Cross-Platform Asynchronous INterface Toolkit) is a true AJAX (Asynchronous JavaScript XML) and JSRS (JavaScript Remote Scripting) implementation that supports both PHP and ASP/VBscript.
A. Brown, and S. Harper. Proceedings of the International Cross-Disciplinary Conference on Web Accessibility, page 28:1--28:4. New York, NY, USA, ACM, (2011)