The best open source alternative to Zoho Analytics is RAWGraphs, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Zoho Analytics and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Zoho Analytics are Plotly (Freemium, Open Source), Bokeh (Free, Open Source), NVD3 (Free, Open Source) and QueryTree (Free Personal, Open Source).
RAWGraphs is an open source app built with the goal of making the visualization of complex data easy for everyone. Born as tool for designers and vis geeks, RAWGraphs aims at providing a missing link between spreadsheets and vector graphics editors.
QueryTree is a flexible and powerful database reporting tool. Simply connect your database and start visualizing your data in minutes. Everything works with a dropdown menu interface - no code or SQL needed.