Mentec  
   PDP-11 operating systems plus layered products and services.
   http://www.mentec.com/

The PDP-11 FAQ  
   Information for those who are enthusiasts, curious, or downright confused as to what the -11 was and is, and how it related and still relates to its world.
   http://www.village.org/pdp-11/faq.html

PDP11 RT11 Games  
   Compiled games list for the DEC PDP11 computers running RT11.
   http://www.geocities.com/CapeCanaveral/5517/pdp11.htm

Metalab.unc.edu  
   PDP-11 freeware archives.
   http://www.ibiblio.org/pub/academic/computer-science/history/pdp-11/

Pdp11.org  
   Dedicated to preserving the history and legacy of the PDP-11 series of 16-bit minicomputers.
   http://www.pdp11.org/

The PDP-11 Unix Preservation Society  
   Devoted to the preservation of all information related to the versions of Unix that ran on Digital PDPs.
   http://minnie.tuhs.org/PUPS/index.html

RSTS-11 Library Entries  
   Compiled by Tim Shoppa.
   http://pdp-11.trailing-edge.com/rsts11/

YAPP  
   "Yet another PDP-11 Page", from John Holden.
   http://www.psych.usyd.edu.au/pdp-11/

pdp11.co.uk  
   Information, pictures and profiles on the PDP-11 family of computers and peripherals.
   http://www.pdp11.co.uk/

Trailing-edge.com  
   PDP-11 freeware CDs.
   http://www.trailing-edge.com/www/freeware.html

Field Guide to Qbus and Unibus Modules  
   This list is an attempt to coalesce all net knowledge on PDP-11 UNIBUS and Qbus modules.
   http://world.std.com/~mbg/pdp11-field-guide.txt