GoJS makes constructing diagrams of complex Nodes, Links, and Groups easy with customizable templates and layouts. GoJS offers many advanced features for user interactivity such as drag-and-drop, copy-and-paste, transactional state and undo management, palettes, overviews, data-bound models, event handlers, and an extensible tool system for custom operations.
Meteor. Documentation - Meteor. Meteor is an ultra-simple environment for building modern websites.