License and Source Code
The Riverscapes Viewer is made available under the GNU Public License Version 3. The ArcGIS AddIn source code is available as an open source project on GitHub. And the QGIS source code is also available as an open source project on GitHub.
Web Viewer
WebRAVE is written using a collection of web technologies, most notably React and node.js.
QViewer for QGIS
The QViewer code is written in Python using the Qt development framework. It requires QGIS to be installed.
ArcViewer for ArcGIS 10.x
The ArcViewer code is written in C# using Visual Studio 2015 and requires ArcGIS 10.x to be installed along with the Software Development Kit (SDK). There is currently no version for ArcPro.