I would like to find out if there are any Non-ESRI GIS web applications that would serve as an appropriate replacement to the ArcGIS Web AppBuilder application.
A version of the ESRI web app builder application can be customized using JavaScript with custom widgets and a dashboard showing different type of charts to display statistical information about the data displayed in the webmap. So I was hoping to find out if there are any open source or paid web application softwares that would offer similar functionality of application/widget customization.