Echo2
In late 2005, NextApp formally announced the release of their new AJAX based web application platform, "Echo2". This framework built on the concepts of Echo (well known API, total web abstraction) but delivered the additional benefit of being an AJAX environment. NextApp believed that this approach brought the framework extremely close to the capabilities of rich clients. NextApp also claimed that this reincarnation of the Echo framework provided dramatic performance, capability, and user-experience enhancements made possible by its new Ajax-based rendering engine.
Read more about this topic: Echo (framework)