Baldhead Cabinets
Offers steel, modular garage enhancement and workbench storage systems.
http://www.baldheadcabinets.com/

PIPS: Automatic Parallelizer
Free, open and extensible workbench for automatically analyzing and transforming scientific and signal processing applications. The PIPS workbench is especially relevant for people interested in whole program compilation, reverse-engineering, program verification, source-to-source program optimization and parallelization.
http://www.cri.ensmp.fr/~pips/

Teclab
Teclab is the leader in the design, manufacture and installation of laboratory furniture, ergonomic workstations, workbench systems, and storage equipment.
http://www.teclab.com/

Mobile Augmented Reality Systems (MARS)
The project at Columbia University informs on application scenarios (e.g. campus information system, journalist's workbench) as well as the system architecture.
http://www.cs.columbia.edu/graphics/projects/mars

LWB
the main page of the LWB Documentation
http://www.lwb.unibe.ch/

InterBase Workbench
GUI tool for editing and creating databases.
http://www.interbaseworkbench.com

K3Studio
A universal workbench for 2d/3d modeling, visualization and simulation.
http://k3studio.sourceforge.net/

amiwm
X window manager that tries to look and feel like Amiga Workbench.
http://www.lysator.liu.se/~marcus/amiwm.html

JaMBW
Java based biologist's workbench by Luca I.G.Toldo.
http://www.bioinformatics.org/JaMBW/

OpenWorkbench.de
Open Workbench - Open Source Project Management and Project Scheduling for Windows from CA Clarity
http://www.openworkbench.de/