Manual pages for Ubuntu Linux.

Prototype of a translator from a python-like syntax to C. Found via
https://www.jwz.org/blog/2017/04/python-has-a-lot-to-fucking-answer-for/#comments

On http://xed.ch/help/, a number of useful personal technical notes can be found.

For example, http://xed.ch/help/usbdrive.html describes how to create bootable USB drives.

Example of an Org-mode document.

70 presentation slides explaining the git version control tool. Found via
Sumana Harihareswara's blog
http://www.harihareswara.net/sumana/2016/08/04/1

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.

Forums for discussing modern cryptographic practice. As of 2016-07-19, there are two mailing lists:
Curves - Elliptic curve cryptography.
 New curves, implementation techniques, and protocols such as PAKE and  
 signatures.

Messaging - Secure end-to-end messaging.
 New approaches to key management, authentication, usability, and deployment.

Issues with new ubuntu tablet
Asked by Paul Harmsworth on 2016-04-22

The links from this page display HTML renderings of the man pages from the Linux man-pages project as well as a curated collection of pages from various other free software projects.
From the author of
The Linux Programming Interface
http://man7.org/tlpi/index.html

From the foreword by Tom Truscott:
Netizens: On the Impact and History of Usenet and the Internet is an
ambitious look at the social aspects of computer networking. It examines
the present and the turbulent future, and especially it explores the
technical and social roots of the "Net". A well told history can be
entertaining, and an accurately told history can provide us valuable
lessons.