GoJS is described as 'Feature-rich JavaScript library for implementing interactive diagrams across modern browsers and platforms. GoJS makes constructing diagrams of complex Nodes, Links, and Groups easy with customizable templates and layouts' and is an app in the development category. There are eight alternatives to GoJS for a variety of platforms, including Self-Hosted, JavaScript, Mac, Windows and Linux apps. The best GoJS alternative is mxGraph, which is both free and Open Source. Other great apps like GoJS are Draw2D, JavaScript InfoVis Toolkit, JointJS and KeyLines Graph Visualization Toolkit.
mxGraph is too low level compared to GoJS