RealDOS
A barebones DOS alternative.
http://www.realdos.de/english/

NBE Computers
Sells barebones computer kits and hardware.
http://www.barebonespckits.com/

OutletPC.com
Shop for computer hardware, PC Repair, laptops, and custom systems online at OutletPC.com or visit our store in Las Vegas. Wholesale prices direct to the public.
http://www.outletpc.com

GEM
Presents LCD flat panels, monitors, and barebones systems made by this firm.
http://www.gemca.com/

bpgsql
A barebones PostgreSQL client written in pure Python. [Open Source, MIT]
http://barryp.org/software/bpgsql/

Nova Computers
Offers barebones desktops, laptops, upgrades, and custom built systems.
http://store.novatechgadgets.com

Mailsmith
Barebones Software's mail client with wide variety of features for beginning and power users. For OSX and 9.
http://www.barebones.com/products/mailsmith/index.shtml

Kiosks and Multimedia Corporation
touchscreen kiosks built to ISO9001 quality.
http://www.kiosko.com

Barebones DOS email system
One of my 200 home pages: Email for DOS
http://www.users.globalnet.co.uk/~jchap/tvde.htm

XEBOT
Very powerful multiplatform Rapid Application Development (RAD) system. Easiliy builds complex standalone visual applications using drag and drop techniques
http://xcprod.com/titan/XEBOT/