Blue Coat Systems, Inc.
Hardware proxy appliances for corporate networks offering web caching, virus scanning, content filtering, instant messaging control and bandwidth management.
http://www.bluecoat.com/

LogiSense Corporation
Offers hardware and software proxy solutions for web caching, content filtering and bandwidth management. Also offers ISP billing software.
http://www.logisense.com/

Cisco Systems: Content Engine Series
Network hardware devices that provide optimised web content and application delivery, multimedia streaming and file distribution.
http://www.cisco.com/en/US/products/hw/contnetw/index.html

Stratacache
Hardware appliances offering web application acceleration, multimedia streaming caching, bandwidth management, and integrated antivirus and content filtering options.
http://www.stratacache.com/

Vigos AG
VIGOS Website Accelerator products use data compression techniques to accelerate website performance and reduce bandwidth usage. Hardware and software solutions available.
http://www.vigos.com/

Warp Solutions
Spidercache software offer website acceleration through caching static, rich media and dynamic web content. [Windows/IIS, Unix/Apache] Also offer hardware appliances for larger networks.
http://www.warpsolutions.com/

The Measurement Factory
Performance and standards compliance testing tools for proxies.
http://www.measurement-factory.com/

CacheLogic
Routing and caching appliances focused on reducing the burden of P2P traffic.
http://www.cachelogic.com/

Castify Networks
Provider of content delivery network solutions for internet media businesses, including audio and video streaming.
http://www.castify.com/

Cyberoam
Hardware appliances offering content filtering, firewall, load balancing, anti-virus, anti-spam and caching features. Includes online demo.
http://www.cyberoam.com/