C3.js is described as 'D3-based reusable chart library that enables deeper integration of charts into web applications' and is an website in the Development category. There are more than 25 alternatives to C3.js, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Mac, Windows and Linux. The best alternative is D3.js, which is both free and Open Source. Other great sites and apps similar to C3.js are Plotly (Freemium, Open Source), Chart.js (Free, Open Source), Frappé Charts (Free, Open Source) and Highcharts (Free Personal).
vis.js is a dynamic, browser based visualization library. The library is designed to be easy to use, to handle large amounts of dynamic data, and to enable manipulation of and interaction with the data.