Unix

• Sun Microsystems: http://www.sun.com/
• Hewlett Packard: http://www.hp.com/
• Slackware: http://www.slackware.org/
• Debian: http://www.debian.org/
• Red Hat Software, Inc.: http://www.redhat.com/
• QNX Software Systems Ltd.: http://www.qnx.com/
• S.u.S.E.: http://www.suse.com/
• Caldera Systems, Inc.: http://www.calderasystems.com/
• Digital Equipment Corporation: http://www.digital.com/
• Berkeley Software Design, Inc.: http://www.bsdi.com/
• The FreeBSD Project: http://www.freebsd.org/
• The OpenBSD Project: http://www.openbsd.org/
• The NetBSD Project: http://www.netbsd.org/
• The TrustedBSD Project: http://www.trustedbsd.org/
• System V: http://www.systemv.com/
• Santa Cruz Operation: http://www.sco.com/
• Silicon Graphics, Inc.: http://www.sgi.com/
• Cray Research, Inc.: http://www.cray.com/
• Be, Inc.: http://www.be.com/
• Minix: http://www.cs.vu.nl/~ast/minix.html
• Lynx Real-Time Systems Inc.: http://www.lynx.com/
• NeXT, Inc.: http://www.next.com/
• Convex Computer Corp.: http://www.convex.com/
• Unisys: http://www.unisys.com/
• Acorn Computer Group plc.: http://www.acorn.co.uk/