- 4i2i Communications Ltd
 - Designs algorithims, components, and systems, including video coding, ADSL, error control coding, and digital communication hardware and software. - 5 Star Networks
- Directory of networking companies offering email, network management, protocols, hardware, and testing.
- Interamic Ltd.
- Supplies converged business communications solutions based around network infrastructure, network security, and IP communications. Interamic maintains a proud tradition of resilient, scalable, and secure networking solutions.
- Intercell Solutions
- Provides email network services with virus protection and spam control, networked biometric time and attendance hardware and software, and bespoke intranet and extranet software development.
- Level One
- Manufactures networking products including routers, switches, and wireless LAN products.
- Midland Data Networks
- Supplies computer networking solutions for business or home use. Includes broadband, wireless and cabled LANs, WANs, PC upgrades, and consultancy services.
- Pericom plc
- Provides IT products and services, including software, cabling, and thin client computing, through a range of divisions.
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