Cartoons

• xkcd
• Penny Arcade
• Steeple

News

• BBC News
• Ars Technica
• Anandtech
• The Register
• The Irish Times
• Reuters
• Incident handler's diary
• Dave Barry
• APOD

Weather

• BBC forecast for Cambridge
• Met Office forecast for Cambridge
• metcheck.com forecast for Cambridgeshire
• Shipping forecast
• River levels at Grantchester, Coton, Jesus Green and Baits Bite

Engines

• Google
• Freshmeat
• Currency calculator
• Anagram server
• Traceroute.org
• Multiple traceroute engine
• TinyURL
• WhatTheFont

Dictionaries &c.

• OED
• Webster
• yourdictionary.com
• Perseus project dictionaries (English and German mirrors)
• Music dictionary
• Fowler
• Stanford encyclopaedia of philosophy
• Wikipedia
• FOLDOC
• Mathworld
• Merriam-Webster's word of the day
• dictionary.com word of the day
• wordsmith.org word of the day

Bibliographies

• CiteSeer
• Collection of Computer Science Bibliographies
• DBLP Bibliography
• ACM Computing Research Repository
• ACM Digital Library
• IEEE Xplore
• Elsevier ScienceDirect
• JSTOR UK
• Ingenta
• Computer Science preprints
• Cambridge University Library
• Advice on research and writing

Phone numbers, postcodes and maps.

• BT phone book
• Eircom phone book
• Golden Pages
• UK postcodes
• US ZIP codes
• Post box finder
• AA route planner
• Ordnance Survey election maps
• CIA world factbook
• Historical atlas of Europe

Timetables

• Dublin Bus
• Stagecoach/Cambus
• National Express
• Die Bahn
• National Rail (demunged)
• Train arrivals, departures and delays at Cambridge

Religion, mythology, history

• Catholic
• Ordo praedicatorum
• Ordo fratrum minorum
• Congregatio pro Doctrina Fidei
• Current catholic hierarchy
• The 1997 Catechism, in Latin, and in English
• The 1983 Codex Iuris Canonici, in Latin, and in English
• Bibles
  • Nova Vulgata
  • Vulgata
  • Douay-Rheims
  • Interlinear Greek and Hebrew
• Esoteric, alchemical, rosicrucian
• The gnosis archive
• Adam McLean's alchemy library
• The Hermetic Fellowship's virtual library
• Al Billings's hermetic library
• Twilit grotto esoteric archives
• Some more sacred texts
• Encylopaedia mythica
• CRC library
• General history
• Carcassonne: cité médiévale
• Conservation resources
• Medieval Sourcebook

Laws & governance

• Irish legislation (since 1922)
• UK legislation (since about 1988)
  • Road Vehicles Lighting Regulations (1989)
• Statutes and Ordinances of the University of Cambridge
• They work for you
• Write to them
• Companies House

Music

• Musicals lyrics and libretti
• Musopen
• Sheet music archive
• IMSLP sheet music
• The Mudcat Cafe (Folk, Blues & Trad stuff)
• Session tunes
• Classical guitar tab
• Diatonic Harmonica

Miscellany

• Elite
• British coinage
• Royal Mint
• The Straight Dope
• Urban legends reference
• Strong Bad
• Are you a werewolf?
• UK DIY FAQ
• Sturmey-Archer gears
• How to report bugs
• Cable lacing
• Shipping

Technical standards

• RFC database
• Internet draft tracker
• IP protocol numbers
• IANA port numbers
• DNS parameters and flags
• Ethernet codes (from the IEEE)
• Ethernet codes
• PCI IDs
• Unicode character search
• ISO 3166-1 two- and three-letter country codes (from RIPE)
• ITU-T E.164 international dialling codes
• ANS T1.523-2001 (Telecom glossary)
• PGN
• IEEE Std 1003.1 (POSIX.1) 2013 edition

Technical reference

• Hayes AT modem commands
• VT220 Programmer Reference Manual
• Cirrus CL-GD5446 Technical Reference Manual
• Windows BSOD, NT status and Win32 error codes
• UK radio and TV transmitters
• Radio and TV frequencies in Cambridge
• MSDS: foodstuffs, chemicals
• NIH household products database
• Hazardous substances databank
• Myra's Bike links
• This to that (glue advice)

Operating systems and sysadmin

• Xen
• FreeBSD
• OpenBSD
• NetBSD
• GNU
• Linux
• Debian
• SYSLINUX
• GNU GRUB
• tomsrtbt
• The Coroner's Toolkit (TCT)
• UNIX rosetta stone
• UNIX history
• Windows processes

Network admin

• NTP
• IPFilter
• PPP
• NSD, djbdns and BIND
• exim and qmail
• SAMBA
• MRTG
• CAIDA tools
• PuTTY
• NOC contact list
• MS/Hotmail spam blacklists

Computer security

• CERT
• CVE
• SecurityFocus vulnerabilities DB
• Nessus
• TCSEC and other US DoD certifications

Computer languages

• C
• Python
• Perl (CPAN)
• Standard ML
• OCaml
• SQL Tutorial
• HTML 4.01 entities
• TeX FAQ

Assembly language

• ARM
• IA-32/AMD64 (disassembler)
• DOS/BIOS interrupts
• BIOS memory layout
• I/O ports

Programming tools

• Online interactive compiler
• GCC, GDB, GNUMake
• clang
• LCC
• Dev86
• cc65
• Intel's linux/x86 F95 compiler
• CCache
• Valgrind
• Splint
• Scratchbox
• NAG C and F90 libraries

PDP11

• pdp11.org
• PDP11 archives
• The PDP-11 Unix Preservation Society
• Uppsala University archive

VAX

• OpenVMS Hobbyist License Registration
• VAXstation 3100 Model 76 Owner's Guide

DNARD/Shark

• DNARD (a.k.a. Shark)
• Linux on ARM
• Linux on the Shark

IBM 650

• History of the 650
• IBM archives
• Knuth (1961) on optimization

Pager/SMS tools

• qpage
• sendpage

Physics

• Simple rigid-body dynamics
• Electrostatic generators
• SI units
• Constants, units and uncertainty
• OSA journals
• Light Reading