License is vague:
MINCE (version 2.5, 2.6, and 2.63), DIFF (version 1.1), Scribble (version 1.3), Pencil (version 1.3), and Crayon (version 1.3), along with any associated documentation (the "Materials"), are Copyright © 1980—1985 by Mark of the Unicorn, Inc.

These Materials are provided in accordance with Title 17 U.S.C. Section 107, and distributed without profit, in original and unmodified form, for non-commercial research and educational purposes, for use by those who have expressed a prior general interest in receiving the Materials.

The Portable MINCE authors claim no affiliation, endorsement, or sponsorship whatsoever by the originators of the Materials.

If you wish to use these copyrighted Materials for any purposes beyond "fair use", you MUST locate and obtain permission from the current copyright owner.

Detailed description of the stack layout, use of R5 as frame pointer by the (V6) Unix C compiler on the pdp-11.

See also https://github.com/timnewsham/myv6

A version of a Unix 5th (and 6th) Edition filesystem for Linux. It is read only, and was written for Linux 2.0 on an x86 and so will require a little work to install on other systems and newer kernels, but it is fun to be able to mount old disk images.

Information  about a macroassembler for pdp-11 running v7 unix.

Description of tape archive and date formats in early versions of Unix.

Instructions for the installation of v8 unix on SimH.

FUSE-based filesystem capable of both reading and writing v6 disk images.
https://github.com/jaylogue/retro-fuse

The paper by Melinda Varian sounds interesting.

Here is the quote from her very interesting paper ( I strongly recommend to read at least the beginning of this 73 pages paper -- it provides new insights into how two most interesting operating system Unix and VM/CMS were influenced by Corbato's CTTS and MIT Multix project)
As of 2021-03, the link http://pucc.princeton.edu/~melinda/ is stale, but I found the paper (167 pages)
VM AND THE VM COMMUNITY: Past, Present, and Future by Melinda Varian, April, 1991
on http://www.leeandmelindavarian.com/Melinda/neuvm.pdf

MiSTer is an open project that aims to recreate various classic computers, game consoles and arcade machines, using modern hardware. It allows software and game images to run as they would on original hardware, using peripherals such as mice, keyboards, joysticks and other game controllers.
Found via the TUHS mailing list
https://www.tuhs.org/pipermail/tuhs/2021-February/023014.html