Arbor is described as 'A graph visualization library using web workers and jQuery' and is an app in the Development category. There are four alternatives to Arbor for Self-Hosted solutions, Online / Web-based, Windows, Linux and Mac. The best alternative is D3.js, which is both free and Open Source. Other great apps like Arbor are Graphviz (Free, Open Source), Chart.js (Free, Open Source) and Frappé Charts (Free, Open Source).
D3 allows you to bind arbitrary data to a Document Object Model (DOM), and then apply data-driven transformations to the document. For example, you can use D3 to generate an HTML table from an array of numbers.
Graphviz is open source graph visualization software. It has several main graph layout programs. It also has web and interactive graphical interfaces, and auxiliary tools, libraries, and language bindings.
Frappé Charts is a simple, responsive, modern charts library for the web with zero dependencies and a roughly 15k gzipped file size. From the makers of ERPNext, the library offers a fast alternative with minimal effort needed to visualize data in sleek charts.