| Mentec: PDP-11 operating systems plus layered products and services. |
| Metalab.unc.edu: PDP-11 freeware archives. |
| PDP11 RT11 Games: Compiled games list for the DEC PDP11 computers running RT11. |
| pdp11.co.uk: Information, pictures and profiles on the PDP-11 family of computers and peripherals. |
| Pdp11.org: Dedicated to preserving the history and legacy of the PDP-11 series of 16-bit minicomputers. |
| RSTS-11 Library Entries: Compiled by Tim Shoppa. |
| 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. |
| The PDP-11 Unix Preservation Society: Devoted to the preservation of all information related to the versions of Unix that ran on Digital PDPs. |
| Trailing-edge.com: PDP-11 freeware CDs. |
| YAPP: "Yet another PDP-11 Page", from John Holden. |
Classical
