An open source Web browser editor that authors can use to create and update documents on the Web. Amaya offers integration between browsing and editing features in a single environment. Amaya started at W3C in 1996 as HTML plus CSS style sheets editor. Currently, it supports XML and a number of XML applications, such as MathML. Amaya also includes a collaborative annotation application based on Resource Description Framework (RDF), XLink, and XPointer. Amaya is hosted by W3C and is available for Windows, Unix and MacOS X platforms.