Chart.js - Easy, object oriented client side graphs for designers and developers.
Diagrammm - Fundamentals on data visualization
AnyChart - Award-winning JavaScript charting library & Qlik Sense extensions from a global leader in data visualization! Loved by thousands of happy customers, including over 75% of Fortune 500 companies & over half of the top 1000 software vendors worldwide.
Crossfilter - Fast multidimensional filtering for coordinated views
PlotNeurons - The most simple neural network plotter
Sheetsee.js - Connect Google Spreadsheets and visualizing the data