What are some alternatives?
When comparing Stagraph and NVD3, you can also consider the following products
Tableau - Tableau can help anyone see and understand their data. Connect to almost any database, drag and drop to create visualizations, and share with a click.
Pentaho - Pentaho is a Business Intelligence software company that offers Pentaho Business Analytics, a suite...
Google Charts - Interactive charts for browsers and mobile devices.
Redash - Data visualization and collaboration tool.