CCVisu: A Tool for Force-Directed Graph Layout
CCVisu is a light-weight Java tool for force-directed graph layout and visual clustering. The layout is minimized using the algorithm of Barnes and Hut, and several energy models are supported. The resulting layouts are provided in text format, as VRML or SVG, or displayed on the screen.
http://mtc.epfl.ch/~beyer/CCVisu/

Design Workshop Technologies Inc.
Design Workshop Technologies develops computer aided design software for various microfabrication industries such as microelectronics, photonics, sensors, electronic components, etc. Our Design Automation software is used by engineers worldwide to create a variety of micro-devices such as integrated circuits (IC), RFIC/MMIC, planar lightwave circuits, MEMS, disk heads, imaging sensors, etc. Design Workshop Technologies' physical layout software products are particularly well suited for all aspects of device layout, physical verification and mask preparation.
http://www.designw.com

BayesBuilder: Bayesian network construction tool
SNN Foundation for Neural Networks Nijmegen
http://www.snn.ru.nl/nijmegen/index.php3?page=31

DeskSave
DeskSave is a tool to save and restore the icon layout of the desktop.
http://www.desksave.de

Nostrum India
Tarantula, a tool with pixel level layout control and full drag and drop support.
http://www.indian-sites.com/nostrumindia/

QCADesigner
Quantum dot cellular automata simulator and design layout tool. Can simulate millions of cells. Runs on Linux, Mac OS X, SPARC Solaris. [Free]
http://www.qcadesigner.ca/

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Mediando Communications offre consulenza informatica e realizza applicazioni web, analisi di usabilità, prodotti multimediali.
http://tools.i-use.it/

LSO Layout Service Oldenburg
Herstellung von Leiterplatten, Layouts und Entwicklungen aller Art.
http://www.lso.de/

Layout Manager Launch
A collection of layout managers
http://www.softbear.com/people/larry/javalm.htm

HtmlLayout
Layout Manager that gets the layout and resize behaviors for components from an html-like syntax. [Open Source, LPGL]
http://braindamage.org/htmllayoutdocs/