Example image of eyePlorer eyePlorer map for 'Berkeley Software Distribution': Computer Systems Research Group Operating system University of California, Berkeley Unix AT&T Digital Equipment Corporation Sun Microsystems SunOS Ultrix Workstation 1 Open source UNIX System V FreeBSD NetBSD OpenBSD Unix-like Bell Labs Source code University Computer science PDP-11 Bill Joy Compiler Ex (text editor) Line editor Pascal (programming language) Version 6 Unix C shell Vi Visual editor VAX Version 7 Unix Porting Virtual memory Kernel (computing) DARPA VLSI Project Curses (programming library) Delivermail Job control (Unix) Sendmail Signal (computing) OpenVMS BBN Technologies IP Marshall Kirk McKusick Unix File System BBN Bert Halstead