The Qtask Markup Language and the QML editor are copyright Prolific Publishing, Inc. and released under MIT license. Please see http://www.qtask.com for more information.
User documentation (ie how to use the program) is contained in the package and can be accessed from the program itself. Developer documentation can be found here: http://www.colellachiara.com/soft/Misc/qml/qml-ed.html
Source files (RLP) can be found here: http://www.colellachiara.com/soft/Misc/qml/