Website Publisher - Faking a Graphical Link
Using text links in your menu is very important for both usability and search engine optimization. Learn how to use text in your links without having to lose the style an image providers.
http://www.websitepublisher.net/article/faking_graphical_link/

Graphical MIB-Tree
Graphical overview of various MIB-Trees, including MIB-2, Cisco-MIB.
http://carsten.familie-doh.de/mibtree/root.html

Pure Data (PD)
Real-time graphical dataflow programming environment for audio, video, and graphical processing.
http://puredata.org

Cycling '74
Sells Max/MSP and Jitter, a family of interactive graphical dataflow programming environments for audio, video, and graphical processing.
http://www.cycling74.com/products/maxmsp

Causeway Graphical Systems Ltd.
Produces a range of graphical and reporting tools. Includes details of collaborations, products, support, and demos.
http://www.causeway.co.uk/

Scripting Graphical Commands with Tcl/Tk Mini-HOWTO
A quick introduction by example to creating graphical user interfaces for command line applications with Tcl and Tk.
http://www.tldp.org/HOWTO/Scripting-GUI-TclTk/

DUI
D graphical User Interface: language binding to GTK+ graphical toolkit and OpenGL Extension GtkGLExt. Allows making GUI programs; supports Linux, Windows. [Open Source, LGPL]
http://dui.sourceforge.net/

GraphiCal
A configurable graphics calculator, which displays graphical representations of expressions and formulas, and lets you visualize parameter changes as video clips. Requires VB6 and MFC42 Runtime files. [Win95/98/Me/NT/2000]
http://www.wilhelm-kurz-software.de/graphical/graphical.htm

Vimms 2
Vimms for Linux (Vfl) is a free (open source)development system for linux, areas: measurement and control, data evaluation, and automation
http://www.vimms.org/

G2 Graphical Library
Portable 2D graphics library. Provides a set of functions for simultaneous generation of graphical output on different types of devices.
http://g2.sourceforge.net/