Diagrams for Mac - A diagram editor for visualizing structures and processes
Chart.js - Easy, object oriented client side graphs for designers and developers.
The Data Visualisation Catalogue - Reference tool for data visualisation
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.
nivo - nivo provides a rich set of dataviz components
PlotNeurons - The most simple neural network plotter