There are 2 repositories under pdp-11 topic.
All CPU and MCU documentation in one place
Using the historical unix 2.11 BSD operating system on the PiDP-11. With examples such as cool-retro-weatherstation.
Compiler for PDP-11, written in Python
:heart: A lisp dedicated to bnl intended for use under 2.11BSD on a PDP-11
Original Soviet Tetris as seen on TV (PDP-11(simh)/15ИЭ-00-013(mame))
:computer: Simulation for the architecture of a processor inspired by the ideas of PDP-11 processor
AncientXinu: Early Xinu / Xinu68k releases
:earth_africa: A very simple and small web server for 2.11BSD, called by inetd