I haven't tried it before, but I sneaked a peek and tried to extract
the most important information from the website.

* The program seems to take a discretized vector field as input, and
creates images from these.
* Its functionality seems to be
  - to plot pretty arrows that have a width, size and colour, and are
curved along the vector field;
  - to plot ellipses, which have something to with how much space
there would be between arrows.
  - has two placement strategies for the arrows:
    1. hedgehog: the arrows are placed on a regular rectangular grid;
    2. adaptive: the arrows are placed with a molecular dynamics
(Lennard-Jones) simulation of their bounding ellipses.
  - to make animations of these
* It is a command line tool.
* The output is in PostScript.
* The input can be
  SAG : a simpel ASCII grid;
  GRD2: a pair of GMT(1) grd (netCDF) files representing the
components of the vector field;
  GFS : a simulation file from the Gerris flow solver.
* As for now, the license is GPLv3, but one can "contact the author
for other licensing".
* There are Debian libraries for various architectures that can be
obtained by
  - Downloading the deb from 
http://sview01.wiredworkplace.net/pub/vfplot/debian/pool
  - Adding "deb http://sview01.wiredworkplace.net/pub/vfplot/debian/
testing main" to your sources.list.
* It is written in C.
* It seems to be quite portable, as "the program should compile on any
modern POSIX operating system with a C99 compiler" and there are
binaries for quite some architectures.
* It reached version 1.0 on Sunday.
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