- Aspen Systems Inc.
 - Custom design, manufacture, and service of Linux-based Beowulf clusters, servers, workstations, rackmount and storage solutions, as well as cluster management software. - Cray
- Provider of high performance supercomputing systems and software.
- Encore Computer Corporation
- Leading supplier of open, scalable computer and storage systems for data centre and mission-critical applications.
 Fujitsu Systems Europe Limited
- Offers supercomputers for commercial and technical applications, disk and tape storage devices, global servers, and more.- Hitachi
- Produces information and telecommunication systems, electronic devices, power and industrial systems, digital media, and consumer products.
- Linux Networx
- Designs and builds powerful cluster systems for high performance computing and high availability applications.
- Meiko
- Makers of scalable parallel systems.
- Parsytec Computer GmbH
- Manufacturer of parallel computers for industrial and research applications
- Silicon Graphics, Inc. (SGI)
- Designs and supplies a family of workstations, server and supercomputer systems (under the names Silicon Graphics and Cray) incorporating interactive 3D graphics and digital media technologies.
- Star Bridge Systems
- Sun Microsystems High Performance Computing (HPC)
- Initiative featuring the Java Grande Programme, Cluster Tools, and other enterprise systems.
- Unisys@
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