Enough of the serious stuff. What about a good old blam-session, blasting away at slimy green things (take your finger out of your nose, please...) and putting the Universe to rights?
Invaders, from the WACCI library isn't PD, but it is breath-takingly cheap (i.e. on a disk with dozens of other good programs for six quid) and it's a very good implementation of the first rave computer game. There's something about the tick-tock movement of those pincer-like invader claws across your screen that invokes a primeval urge to annihilate. And annihilate you must, for in this game there's no second chance. Just relentless waves of outlandish creatures crossing your monitor, bent on your blood and the control of your home planet.
Invaders features smooth-scrolling fast graphics, impeccably-drawn invaders, a hideously-difficult-to-get-into High Score table, sexy spot effects and ear-splitting explosions. Get a copy as soon as possible 'cos all your friends are gonna be firmly locked in their bedrooms playing this game for a long time to come...