HP-Compaq Servers
Hp offers a variety of dependable, innovative systems & servers, including the proliant server family, integrity nonstop servers, and hp 9000 servers.
http://www.hp.com/products1/servers/
IBM eServers
Ibm offers proven hardware that drives real results for every-sized business. ibm eserver and systems deliver leading-edge technology developed with an eye towards recognized industry standards.
http://www-1.ibm.com/servers/
SUN
Sun develops the most innovative products and services that power the network economy.
http://www.sun.com/
Unisys
Unisys is a worldwide information technology consulting services and solutions company. with precision thinking and relentless execution we help drive your vision forward.
http://www.unisys.com/