Del site 
ajaxpatterns.org/ viene esta lista de frameworks de ajax para programar de todo:
ejemplos:
Popular:
    * Javascript Multipurpose Frameworks Broader-scope frameworks (e.g. Dojo, BackBase).
    * Javascript Remoting Frameworks Browser-Server Web_Remoting, i.e. XMLHttpRequest wrappers and IFrame wrappers. 
Specialised:
    * Javascript Effects Frameworks Visual Effects.
    * Javascript Flash Frameworks Javascript-Flash Integration.
    * Javascript Logging Frameworks Logging.
    * Javascript XML Frameworks Dealing with XML, XSLT, Xpath, and possibly Web Remoting. (e.g. GoogleXSLT).
    * Javascript Specialised Frameworks Frameworks that don't fit any catgory above, e.g. drag-and-drop or widget libraries.