Software development

• Flex and Bison howto for C++ users - A few notes on using these popular compiler generation tools with the C++ programming language.
• Lex and YACC primer/HOWTO - An introduction to the popular compiler generation tools lex and yacc. Most of it is also suitable for those using the open source equivalents, flex and bison.
• Java homepage - Nothing to do with coffee, this is the official home page for Sun Microsystem's Java programming language.
• PHP homepage - This is the official homepage for the PHP programming language.

Useful software

• LaTeX Formatting Information - An introduction to writing documents with the free and powerful LaTeX formatting system.

Classic computing

• World of Spectrum - All kinds of information about the Sinclair ZX Spectrum.

Technical reports

• Hints on Technical Report Writing - Some notes on writing a good technical report.

Free Software (as in freedom, and often as in beer as well)

• The GNU project homepage - The official homepage of the GNU (GNU's Not Unix) project, creators of some of the world's most widely used free software.

Fun stuff

• Evil Overlord, Inc. - Planning world domination? Want to avoid the mistakes made in the past? Here's the place to start. Contains such wisdom as "I will never employ any device with a digital countdown. If I find that such a device is absolutely unavoidable, I will set it to activate when the counter reaches 117 and the hero is just putting his plan into operation."

Encyclopedias

• Wikipedia - A free online encyclopedia that anyone can contribute to.
• The Hitchhiker's Guide to the Galaxy (Earth Edition) - Another free online encyclopedia open to contributions. This one has some great discussion forums attached as well.

Linux

• LinuxQuestions.org - Their motto says it all, "Where Linux users come for help".

Music

• Nightwish - The official homepage of Finnish metal band Nightwish.
• Sonata Arctica - Another fantastic Finnish metal band.

Internationalisation (i18n)

• Babel Fish - Translate text or web pages from and to many different languages.

Religion

• Religious Tolerance - A site aiming to promote religous tolerance and understanding. Please be warned, this site discusses very controversial issues from all sides, and as such you may find some content offensive.