Markvis is a plugin to generate charts in markdown with few lines of code.
Cytoscape.js is a graph theory library for analysis and visualisation.
Vega is a visualization grammar, a declarative format for creating and saving interactive visualization designs.
With Vega you can describe data visualizations in a JSON format, and generate interactive views using either HTML5 Canvas or SVG.
Yako.js is a tiny DOM-less graph library, build for fast front end and server side rendering in CommonJs pattern. This library is intend to generate light weight and simple SVG graphs, and is more performable compare to highcharts / flot / c3 / d3 when front end matters.
GraspSchedule.js is a simple jQuery calendar plugin used to visualize complex schedules & events loading from JSON data, a little similar to the timeline or event calendar.
Sapo.js is an interactive procedural texture generator that let's you visualize your texture while coding