FTLK Stuff
A cartesian library for plotting 2D graphs and graphic objects, a plotting widget for postscripts exporting, and a text rotation widget.
http://phy19.phy.tcd.ie/fltk/

Pinebush Technologies, Inc.
PINEBUSH Technologies High Speed Plotting & Printing Software Solutions For EDA, IC, A/E/C, CAD, GIS, Engineering, Mapping, Scientific Applications, & More!
http://www.pinebush.com/

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

A Practical Guide to Hurricane Tracking and Plotting
Tracking and plotting the coordinates of the current position and its forecast of hurricanes is fun! But sometimes confusing! Unit conversions, advisories headers of the National Hurricane Center, hurricane names for the next year, definitions, and a lot more little facts can be found in this practical guide
http://stormcarib.com/guide.htm

Unix SysAdm Resources: Unix Printing and Plotting
Information on Unix printing and plotting
http://www.stokely.com/unix.sysadm.resources/printing.html

ButterflyDiagrams of the Sun
The plotting of sunspots with a computer.
http://home.tiscali.nl/~slooten/

Transcopies Inc
Large Format Printing Service on CAD Plotter, in Montreal`s Region / Centre d'impression grand format sur traceur dans la région de Montréal
http://www.transcopies.com

AGIS Map
AGIS for Windows is a mapping and simple GIS shareware package. Plot your own geographic data on the map of the world provided without the high cost and steep learning curve usually associated with this kind of software. Free downloadable demo.
http://www.agismap.com/

Altaxo
Altaxo HomePage: Altaxo Data Visualization and Plotting Program (Open Source software).
http://altaxo.sourceforge.net/

guppi-list
GNOME graphical plotting interface
http://mail.gnome.org/mailman/listinfo/guppi-list