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Create beautiful diagrams in minutes. Simple syntax. Endlessly customizable. D2 is the fastest and easiest way to get a mental model from your head onto the screen, then make edits with your team.

Perspective is an interactive analytics and data visualization component, which is especially well-suited for large and/or streaming datasets. Use it to create user-configurable reports, dashboards, notebooks and applications, then deploy stand-alone in the browser, or in concert with Python and/or Jupyterlab.

Github: https://github.com/finos/perspective

check out ajax.org link (very impressive) and Flot in the comments

Axiis is an open source data visualization framework . Axiis is built upon the Degrafa graphics framework and Adobe Flex 3.

Don't waste your afternoon drawing UML Sequence Diagrams

Timeplot is a DHTML-based AJAXy widget for plotting time series and overlay time-based events over them

Concept mapping tool

PyX is a Python package for the creation of PostScript and PDF files. It combines an abstraction of the PostScript drawing model with a TeX/LaTeX interface. Complex tasks like 2d and 3d plots in publication-ready quality are built out of these primitives.

Graphing Calculator toolbar. Enter an equation into this toolbar, then view the graph using Firefox 1.5 native SVG support. The toolbar allows rescaling the x and y coordinates and redefining the domain of x.

The chart features in OpenOffice are like a mystery-lover's dream vacation: a huge, mysterious old house with lots of long halls, secret bookcases, dark closets and creaky doors that, when you peer behind them, reveal wonderful secrets.