AcceleratedServers
- Customize 1U, 2U and 4U rackmount and tower servers and server clusters running Linux, FreeBSD or Windows.
- http://acceleratedservers.com/

Advanced Clustering Technologies
- Advanced Clustering sells turn-key beowulf clusters with AMD or Intel processors. Configurable online ordering.
- http://www.advancedclustering.com/

RocketCalc
- Manufactures affordable personal clusters and monitoring tools. Information about products.
- http://www.rocketcalc.com/

Armari Ltd
- Sells rack-mountable Intel-based computers as well as workstations and servers. Product information.
- http://www.armari.co.uk/

Atipa Technologies
- Specializes in the design and turn key installation of large computational clusters based on Intel, AMD, and Alpha processors. Information about products and online ordering available.
- http://www.atipatechnologies.com/

Western Scientific, Inc.
- Provider of turnkey Beowulf computing cluster hardware for different platforms from Intel, AMD, Alpha, and HPC.
- http://www.wsm.com/

hpcLine
- Rackmountable clusters with Myrinet interconnects. Product information and datasheets.
- http://www.hpcline.com/

Aspen Systems, Inc.
- Manufacturing, design and service of HPC clusters and other high-performance systems.
- http://www.aspsys.com/

Linux Computer Systems
- Customizable Beowulf nodes, workstations, and servers. Product and contact information.
- http://www.linuxcomputersystems.com/

Microway
- Alpha, Athlon, or Pentium Linux clusters. Product and contact information.
- http://www.microway.com/

Atipa
- Atipa provides scalable, high performance, turnkey Alpha, AMD, and Intel-based Beowulf clusters. Product information.
- http://www.atipa.com/

Integrity Linux
- Customizable Linux clusters with parallel software. Product and contact information.
- http://www.integritylinux.com/

RackSaver, Inc.
- Specializes in Beowulf clusters with tiny footprints. Product information.
- http://www.racksaver.com/

PSSC Labs: The Beowulf People
- Provides custom Beowulfs and workstations. Online quote form.
- http://www.pssclabs.com/

Penguin Computing
- Intel-based rackmountable clusters with traffic management software.
- http://www.penguincomputing.com/

Linux Networx
- Custom rackmountable Linux clusters with graphical management tools. Product information and company news.
- http://www.linuxnetworx.com/

Scali AS
- Provides scalable Linux and Solaris based cluster computer systems ranging from high performance clustering kits to turnkey supercomputers with cluster management tools. Product information.
- http://www.scali.com/

ParTec AG
- Sells high-performance clusters. Product and contact information.
- http://www.par-tec.com/

Carrera Computers
- Pentium-based Beowulf clusters. Product specs.
- http://www.carrera.com/