It's relatively easy to bring up a V6 PDP-11 Unix under the Ersatz-11 PDP-11 emulator. This page (and ancillaries) tell you how to do it, and provide a number of useful tools to go with V6 Unix. (I ran into a number of pitfalls on the way to getting V6 running, using RK05 disk images from the TUHS archive, but this short writeup will tell you how to avoid them all.)

Alexandre Stefanov long maintained a list of online math texts and other materials at Geocities, but it appears that his original web site is no longer available. Because these resources may be of interest to our readers, we present here a modified version of Stefanov's list as of November 18, 2009. We welcome corrections or suggested additions to this list.

stali is a brand new static linux distribution based on the original pre-2010 plans of the suckless.org project, but with a couple of revised goals:

stali goals
Follow the suckless philosophy
Target x86_64 and arm (RPi) support

With the rising availability of Extensible Firmware Interface (EFI) and Unified EFI (UEFI) computers, there's an increasing need to configure EFI boot loaders, particularly in multi-boot environments. The way EFI computers boot is very different from the way older computers based on the Basic Input/Output System (BIOS) boot. This fact is both positive and negative. On the plus side, the EFI boot method is much more flexible and, in theory, easier to configure than is the BIOS boot method. On the minus side, existing documentation and personal skills are often built around BIOS, which can make setting up an EFI-based system tricky. There's also the fact that EFI support in Linux distributions is much newer than BIOS support, so there tend to be more EFI glitches.

Minisign is a dead simple tool to sign files and verify signatures.

It is portable, lightweight, and uses the highly secure Ed25519 public-key signature system.

This is an Emacs configuration file written in Org mode. It is an attempt to keep ~/.emacs.d tidy, but still be able to keep it all in one file. Contains brief explanations of the configurations.

A literate programming tool for Emacs.

Beginning with the Eighth Edition, ed(1) had the following command.
This is from the Plan 9 ed man page.

         (.,.)b[+-][pagesize][pln]
              Browse.  Print a `page', normally 20 lines.  The
              optional `+' (default) or `-' specifies whether the
              next or previous page is to be printed.  The optional
              pagesize is the number of lines in a page.  The
              optional `p', `n', or `l' causes printing in the speci-
              fied format, initially `p'.  Pagesize and format are
              remembered between `b' commands.  Dot is left at the
              last line displayed.