Jarno Luoma-Nirva

Net

Internet Acronyms
What all those weird TLAs mean in internet discussions.
IT and communication by Jukka Korpela
Excellent resource for many topics about Net, from web authoring to Usenet. (fi: Varsin kuuluisa näistä on Nyysiopas. Hyvää luettavaa on myös Web-julkaisemisen opas )
Open Directory Project
When you need a bit more comprehensive link list than this.
Python Language Website
An excellent interpreted language. Especially suitable for web programming.

Games

Areena-pelit (fi)
Gladiaattorimanagerointipeli.

Civilization clones

Freeciv
A very good clone of Civilization II (though has rules for Civilization I as well). Runs on both Windows and Linux (and several other platforms), has network play and, of course, is free.
Civ Evolution
Another non-commercial game based on Civilization. Features self-designable units and fully deterministic gameplay. Still in development, but reasonably playable already. The standard AI is pretty helpless yet, but there are others you can try.

Interactive Fiction

Interactive Fiction is the new name for games previously known as text adventure games. The new games are mostly free and written by real writers instead of programmers. Some of my favorites, made by Adam Cadre : Photopia (Short, easy and has an excellent story. Good game to start), Shrapnel (Also short and almost puzzle-free. Violence and twisted humor) and Varicella (King has died, and the ministers compete to become Regent. Palace Minister needs a cunning plan to eliminate the competition. Evil characters, treachery and dark humor. Relatively short, but has real puzzles).

Inform
Programming language(or "design system") for creating Interactive Fiction games.
The Interactive Fiction Archive
The archive itself.

Roguelikes

Doom the Roguelike
Demons, shotguns and chainsaws. A roguelike based on the classic first-person shooter. Very simple, might be good intro to roguelikes.
Dungeon Crawl
Perhaps not one of the most famous roguelikes, but one of my personal favorites. Simple, short and playable. Unfortunately, apparently no longer developed.
Nethack
Probably the most famous roguelike.
Thangorodim - The Angband Page
Angband is another popular rogulike. Has tons of variants.