Apache -- the de-facto standard Web server -- has a caching proxy module.
ARA Network Technologies is a Korean company that sells a caching product called Jaguar2000.
aVirt has a pair of software products that run on Windows 95, 98, and NT. Spaghetti is designed for home, while GatewayServer is for office networks. Both proxy many protocols in addition to HTTP.
CacheFlow became BlueCoat in September 2002, now placing more emphasis on security, and less on caching.
Cachier makes a stand-alone hardware device that is easily installed in front of web servers. It is designed to increase the speed of dynamic content delivery.
Ceeyes acquired the intellectual property of Lucent's caching-related products.
CERN is the original Web server and proxy cache. It is not used much these days, but included here for historical interest.
Chutney Technologies' software-based solutions address performance and scaling issues caused by the increasing use of personalized and interactive features within E-business web sites.
CinTel is a Koren company that sells a caching appliance built around iMimic's DataReactor software.
Cisco has an appliance called the Cache Engine. The product, which is small and modular, is designed for clustering with WCCP.
Cobalt Networks sells a Squid appliance, which they call CacheRaQ. Sun acquired Coblat in December 2000.
Compaq's caching product is the TaskSmart C-series server. They were originally using Novell/Volera software, then switched to Inktomi. Since Inktomi cut their caching products (July 2002), we don't know what Compaq is using.
Computer Software Manufaktur (CSM) sells a proxy cache software product for Microsoft Windows and Linux.
ContentCache, made by Avantis and powered by Microsoft Internet Security and Acceleration (ISA) Server, is a smart web caching appliance that is installed on a school network to speed up access to web content and e-learning resources. ContentCache offers much more than a standard caching device - enabling the selection, pre-caching and pre-loading of web content as well as dynamic caching.
DeleGate is a versatile caching proxy server that runs on Unix, Windows, and OS/2 platforms. Delegate also supports proxying of numerous non-Web protocols.
Dell's caching product is a PowerApp appliance running the Novell/Volera software.
Entera used to have a caching appliance. CacheFlow acquired Entera in December of 2000.
Eolian sold a Squid appliance, but the company closed December 31, 2000.
F5 sells caching appliances that use the iMimic DataReactor software.
IBM's caching product, a Netfinity server, runs the Novell/Volera software on IBM hardware. IBM may also still sell their Web Traffic Express software.
iMimic offers both hardware and software solutions of their DataReactor. You can also buy iMimic software on appliances from one of their partners.
InfoLibria apparently ceased operations in Sept 2002.
LogiSense Corporation offers a proprietary software product known as CacheXpress which also supports WCCP v1 and v2 and Layer 4 switching and other methods of transparency. They have versions for Microsoft NT/2000 and Linux platforms.
Inktomi used to sell a software product known as Traffic Server. However, they announced (July 2002) that they are exiting the caching business.
Lucent has discontinued their Web caching appliance product line, and licensed the technology to Ceeyes.
Microbits is an Australian company that sells products running the Novell/Volera software.
Microsoft has a high-end product called ISA server. The older Microsoft Proxy Server is a software product that runs on Windows NT.
MOWS is an open source Web server and proxy cache that is written in Java.
Netscape Proxy Server is probably the first commercial caching proxy product available. Some of the developers of Netscape's proxy also worked at CERN on the original HTTP server/proxy.
netSTOR sells a caching appliance that smells like a Squid.
Network Appliance has been in the business longer than most, and has roots in the Harvest project. They offer a number of appliance models. Their software product is probably being phased out.
Oops! is a proxy server; the main aims of its development being stable operation, service speed, main protocols support, modularity, ease at use.
Oracle9iAS Web Cache combines caching, compression and assembly technologies to accelerate the delivery of both static and dynamically generated Web content. It also implements Edge Side Include (ESI) protocol advanced by Oracle, Akamai, and others.
Peregrine is software developed by the University of Wisconsin. Peregrine became Tasmania Network Systems, Inc. for a while, which was then acquired by Cisco.
Roxen is an open source Web server platform that includes a proxy caching module. Roxen runs on both Microsoft Windows and Unix.
Squid is freely available, open source software that runs on most Unix platforms. Squid is likely the most widely deployed caching solution and full of many useful (and some not-so-useful) features.
Stratacache sells a number of products running Novell/Volera ICS. Stratacache tends to focus on small business and home office users.
Swell Technologies sells a number of Squid appliances.
Jigsaw is the W3C's Web server with a caching proxy module that implements the HTTP/1.1 protocol standard. Jigsaw is written in Java, and runs on numerous hardware platforms.
Vividon's Streaming Delivery Systems are specifically designed to help service providers and e-learning organizations -- including corporate, educational and government environments -- meet the challenges of economically delivering large volumes of streaming content.
Volera is the Novell spin-off of the group responsible for their caching products. What used to be known as Novell Internet Caching System (ICS) is now called Excellerator. Volera OEMs their product through a number of hardware manufacturers.
Wcol is an open source prefetching and caching proxy server that runs on Unix platforms.
WBS (Web Business Software) offers a server accelerator product called Jxel.
Alteon, now Nortel.
Arrowpoint Communications, now Cisco.
Netscaler's 9000 Series systems include Layer 4-7 switching, optimization, and security capabilities in one single, unified platform. The products also incorporate dynamic in-memory caching.
See also www.linuxvirtualserver.org and Piranha Howto for an open-source (Linux) L4 solution.
See also Eddie: a high availability WAN and LAN clustering tool for web servers (including Apache). It provides load balancing at two levels (DNS and LAN), failover redundancy, and admission control to maintain quality of service levels. Apparently, F5's 3DNS product is based on this source.