Here's a link to a distribution for the E8 emacs-like editor I mentioned:
https://tangentsoft.com/e8/wiki?name=Home
Also, tangentsoft has a bunch of information about software development
related to the PiDP effort, including their version of the C compiler.
https://tangentsoft.com/pidp8i/wiki?name=Home
https://tangentsoft.com/pidp8i/doc/442d9cff50/src/cc8/README.md
The PiDP project has generated quite a bit of attention to the PDP-8
over the last several years.
Vince