Amaya (formerly Amaya World)[4] was a free and open source WYSIWYG web authoring tool[5] with browsing abilities.

It was created by a structured editor project at the INRIA, a French national research institution, and later

Amaya Browser

adopted by the World Wide Web Consortium (W3C) as their testbed for web standards;[6] a role it took over from the Arena web browser.[7][8][9] Since the last release in January 2012, INRIA and the W3C have stopped supporting the project and active development has ceased.[10][11]

Amaya has relatively low system requirements, even in comparison with other web browsers from the era of its active development period, so it has been considered a "lightweight" browser.[12]

It's a integrated fusion between Internet Explorer and Netscape. 

It might be unknown if it's a web editor or a original browser.