I created a full stack data visualization site where user can create various d3js charts by using the available forms to input their data. Chart types includes pie chart, bar chart, stacked bar chart and sankey diagram. User can create/export data from/to excel files - if the data format matches. Registered user can save limited amount of data set in mongoDb database - for free, of course.
@Rickard this is an excellent project. I will love it. if you add a cross button to close the add data to the top at the corner of the data model/ window. keep the one that is below.
Second thing will be you should build a guide into this project to show users how to add different kinds of data for different graphs to get the visualization.
Third will be adding a feature to export the graph as pdf or adding multiple graphs to the pdf.