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https://www.gnu.org/software/plotutils/
The GNU plotutils package contains software for both programmers and technical users. Its centerpiece is libplot, a powerful C/C++ function library for exporting 2-D vector graphics in many file formats, both vector and bitmap. On the X Window System, it can also do 2-D vector graphics animations. libplot is device-independent, in the sense that its API (application programming interface) does not depend on the type of graphics file to be exported. A Postscript-like API is used both for file export and for graphics animations. A libplot programmer needs to learn only one API: not the details of many graphics file formats.
The package also contains command-line programs for plotting scientific data, such as GNU graph for XY plotting. Many of them use libplot to export graphics. So, they can export graphics in any of libplot's supported formats, such X, png, pnm, gif (bitmap formats), or svg, ps, ai, cgm, fig, pcl, hpgl, regis, tek (vector).
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