Software and Documentation

Beautifiers and Pretty Printers
Best of ZSH Tips
Best Practical
chubin/cheat.sh : the only cheat sheet you need
Codewars
Designing an Authentication System: a Dialogue in Four Scenes
Disroot
Essays on programming I think about a lot
Flight Gear Flight Simulator
Gitea git repository server
Gnu Documentation
hacker-laws
How to Create Your Own SSL Certificate Authority for Local HTTPS Development
Internet RFC/STD/FYI/BCP Archives
LFTP - sophisticated file transfer program
Life with qmail
Manx - Catalog of Online Computer Manuals
Mathematics for Programmers
Meld
Multicast over TCP/IP HOWTO
MySQL Documentation
MythTV
OpenVPN project
PDP-11 Home Page at metalab.unc.edu
PDP-11 - Introduction
perlgov - Perl Rules of Governance - Perldoc Browser
Producing Open Source Software
Protocol Buffers - Google Code
qmail-spp - Home
RealPlayer Home Page
RT Wiki
SANE - Scanner Access Now Easy
Schedules Direct - TV listings for MythTV
SSH: Convert OpenSSH to SSH2 and vise versa
Stack Overflow - Q&A
The Graphics File Format Page (2D specs)
The Xarm Home Page
UK Mirror Service: sites/www.bitsavers.org/bits/DEC
Unicode Character Code Charts
UNIXguide.net AIX, FreeBSD, HP-UX, Linux, Solaris & Tru64
Version Control with Subversion
Welcome to the Linux Graphics Driver from Intel site | Graphics
Winsock Programmer's FAQ
Work: Practical CVS, part 2
Xah's Emacs Lisp Tutorial
XMCD Home Page
Xterm Control Sequences
Zsh unix shell

Android

Android Developers
Android Development
Introduction to Android Development

BSD

NetBSD/alpha
NetBSD/vax
OpenBSD
OpenBSD/alpha
OpenBSD/vax
The NetBSD Project

C/C++/OO

Alex's Software
An Interview with A. Stepanov for Edizioni Infomedia srl
Bjarne Stroustrup
Bob Stout's SNIPPETS
Boost C Libraries
Boost C++ Libraries
C++17 in detail (book)
C++ Archive
C++ in the Real World
cplusplus.com - The C Resources Network
cppreference.com
Guru of the Week
Modern C++ Tutorial: C++ 11/14/17/20 On the Fly
Standard Template Library Programmer's Guide
STLport Home Page
The ADAPTIVE Communication Environment (ACE)
The Boost C++ Libraries

CD-R/RW

CD-R FAQ

Flex

6800 instruction set
FLEX 2.0 For SWTPC 6800
FLEX Softwae Archive
GitHub - jefftranter/6800: Code related to the Motorola 6800 microprocessor.
GitHub - jhallen/exorsim: Motorola M6800 (6800) Exorciser / SWTPC emulator
MC6800 Instruction Set Summary

iPhone

Building iPhone Apps with HTML, CSS, and JavaScript
iui - UI Framework for iPhone WebApp development

Java

ANTLR
Apache Ant
Apache Maven
Example Depot | Useful code samples
Java Junkies
Java Tutorials - Online Training and Tutorials from Sun
NetBeans Docs & Support
NetComputing - Makers of AnyJ Java IDE
OpenORB On SourceForge
Programming tutorials, problems, solutions. Always with code.
Sun's Java Home Page
The Jakarta Project
Tritonus: Open Source Java Sound

LDAP

LDAP HOWTO
LDAP Roadmap
OpenLDAP Home Page
PADL Software Pty Ltd - Documentation and Open Source Tools

Mac OSX

Homebrew Package Manager
MacPorts Guide

Multimedia

ardour | the new digital audio workstation
Audacity Audio Editor and Recorder
CD Paranoia audio CD digital audio extraction application
Hydrogen advanced drum machine for GNU/Linux
Planet CCRMA at home
Rosegarden: music software for Linux
TAP-plugins
The CAPS Audio Plugin Suite

OpenVMS

CRINOID.Com
The DEC Connection - A premier interactive networking organization for former Digital Equipment Corporation employees
Documentation -- VMS Software, Inc.
Encompass (previously DECUS)
ES40 Emulator
HoffmanLabs
HP Communities OpenVMS Community Forum
List of Products from VMS Software, Inc.
OpenVMS ActiveMQ
OpenVMS Freeware
OpenVMS Freeware CD
OpenVMS Freeware CDs
OpenVMS Hobbyist
OpenVMS Notes: GNV
OpenVMS Online Documentation Library
OpenVMS.org - OpenVMS Community Portal
OpenVMS Progamming Demos
Alexey Chupahin's OpenVMS Software Porting Page
TCL/TK OpenVMS Project Site
The OpenVMS Frequently Asked Questions (FAQ)
VMS Perl Home Page
vmsperl Mailing List Archive
VMS/RMS INTERNAL DATA STRUCTURES
VMS software
VMS Software, Inc.
VT100.net: VT330/VT340 Programmer Reference Manual
WASD - The only Web environment implemented expressly for VMS

Oracle

ArsDigita Systems Journal: Fault Tolerant Oracle Installation
One-Page Oracle API, Oracle Call Interface Template Library (OTL), Version 2.0.0
Oracle Database Online Documentation 10g Release 2 (10.2)

Perl

Comprehensive Perl Archive Network (CPAN)
CPAN Searches
CPAN Testers
FormBuilder Perl CGI Form Builder CPAN module
Higher-Order Perl
O'Reilly's Perl Page
PAUSE Documentation
Perl Authors Upload Server (PAUSE)
Perl Documentation
Perl In 20 Pages
Perl Infrequently Asked Questions List
Perl Monks
Perl Reference Guide
Perl-Win32-ASP FAQ
The Perl Home Page
ActivePerl 5.8 - Online Docs : Tk
TkDocs Home
VMS Perl | Perl on OpenVMS
WAIT - The Great CPAN Search Engine

PostgreSQL

Cygwin allows PostgreSQL to run on Windows
Documentation
General Bits - mailinglist summaries
JDBC Driver
Lesser Known PostgreSQL Features | Haki Benita
ODBC Driver
PostgreSQL
PostgreSQL, Inc.
Streaming Replication - PostgreSQL wiki
The Internals of PostgreSQL

Python

An Intro to logging
Django Web Framework
Practical Python Programming - a course by @dabeaz
PyCoder's Weekly | A Weekly Python E-Mail Newsletter
PyCoder's Weekly Issue Archive
Python 2 to 3 conversion
Python 3 Documentation
Python PostgreSQL tutorial with psycopg2 module
Python Weekly : A Free, Weekly Python E-mail Newsletter
Welcome to Python.org

SimH

DSM-11 - PS8 - Computing & Engineering
GitHub - simh/simtools: Tools useful when using or migrating to or from a simh simulator environment
Open SIMH · GitHub
simh github repository
SimH Home Page
The Simh Mailinglist Archives
SIMH on SourceForge.net
Xhomer project - Pro 350 emulation

SSH

How to properly manage ssh keys for server access

Web

Alertbox: Jakob Nielsen's Newsletter on Web Usability
A List Apart
Amaya Overview
Analog: WWW logfile analysis
Cascading Style Sheets, level 1
Cascading Style Sheets, level 2 revision 1
Choosing an HTTP Status Code
Code Charts - Scripts
Colour Contrast Check - snook.ca
CSS3 Media Queries
CSS - Contents and compatibility
CSS Font and Text Style Wizard
demoroniser - correct moronic and gratuitously incompatible Microsoft HTML
Global Authoring Practices for the Mobile Web
Google Calendar APIs and Tools - Google Code
Hot Scripts - The net's largest PHP, CGI, Perl, JavaScript and ASP script collection and resource web portal.
HTML 4.0 Special Entities
HTML Home Page
JavaScript Toolbox - Reusable Libraries And Objects
osCommerce , Open Source Online Shop E-Commerce Solutions
PHP: Hypertext Preprocessor
Randal's WebTechniques columns
Serendipity Weblog System
SitePoint : New Articles, Fresh Thinking for Web Developers and Designers
The W3C CSS Validation Service
The W3C Markup Validation Service
TikiWiki CMS/Groupware
TikiWiki for Smarties: A beginner's guide
W3C HTML Validation Service
W3Schools Online Web Tutorials
ZVON.org - XML related information and tutorials

XML

The XML C parser and toolkit of Gnome
XML Schema Part 0: Primer Second Edition

X Windows/Motif

About ViewKit
Kenton Lee: Home Page
Kenton Lee: Technical X Window System and OSF/Motif WWW Sites
Motif Books
Motif Programming - Dave Marshall
The Motif Zone
xterm / Escape Sequences