Cray-Cyber
- Free interactive access to historical supercomputers such as a Cray Y-MP EL running UNICOS or a Cyber 960 running NOS.
- http://www.cray-cyber.org/

Cray Supercomputer FAQ
- An extensive set of questions and answers on topics such as Cray Supercomputer families and buying secondhand machines. Includes technical documents and anecdotes.
- http://www.spikynorman.dsl.pipex.com/CrayWWWStuff/index.html

CRAY-1 Hardware Reference Manual
- The first 3 chapters of the CRAY RESEARCH CRAY-1 Hardware Reference Manual 2240004, Revision C.
- http://www.ed-thelen.org/comp-hist/CRAY-1-HardRefMan/CRAY-1-HRM.html

ExCray.com
- Resource for alumni of Cray Research. Includes a database of members, free e-mail addresses, news, and a bulletin board.
- http://www.excray.com/

Cray User Group
- An independent, international consortium of organizations that own or use Cray or SGI computer systems. Includes membership details, announcements, conference details, and working group information.
- http://www.cug.org/

A Seymour Cray Perspective
- Slides from a technical presentation given by Gordon Bell of Microsoft Research.
- http://research.microsoft.com/users/gbell/craytalk/