Plot Maestro
Gradebook, plotting, and testing software for teachers
http://www.rredware.com/pmdetails.htm

Sepialine
Sepialine tracks expenses - print, copy, scan, fax and more - for design, graphics, communications, reprographics and FM providers worldwide.
http://www.sepialine.com/

MatSeis
MatSeis is a seismic toolbox for MATLAB. It provides a time-distance profile plot integrating origin, waveform, travel-time, and arrival data with graphical plot controls, data manipulation, and signal processing functions.
https://www.nemre.nnsa.doe.gov/cgi-bin/prod/nemre/matseis.cgi

Journey to the Lost Isle Plot
Weblog with a guide to the Lost Isle Plot.
http://jttlip.wordpress.com/

Etrage LLC
Developer of an automation COM interface for Pro/ENGINEER and Pro/INTRALINK, a plot service for Pro/INTRALINK (PSI) and related products.
http://www.etrage.com/

Repro-Kopier-Service (RKS) Oberasbach GmbH
Die Seite informiert über das Angebotsspektrum des Unternehmens in den Bereichen Druck, Scan, Kopie und Plot. [D-90522 Oberasbach]
http://www.repro-kopier-service.de

GPLOT and XYPLOT Plotting Libraries
GPLOT can be used to plot variables from inside any Fortran program. This subroutine is not intended to replace other graphics packages, or plotx, but to rather allow the user to look at arrays of data in the middle of fortran codes. XYPLOT is also not intended to replace plotxy, but to work as a user-friendly interactive program, in which plots of data files can be created from the command line. It is interactive in the sense that the user can input some parameters and the program can interpret the parameters given and create a plot of the desired data file.
http://www.eqinfo.ucsd.edu/~gprieto/software/gplot.html

KSciPlot
An application to plot mathematical functions.
http://ksciplot.sourceforge.net/

Piltdown Plot
Explores one of the most famous scientific hoaxes in history.
http://www.clarku.edu/~piltdown/pp_map.html

Plot 3D
Homepage of Plot3d - fun easy 3d graphing on Windows
http://www.plot3d.net/