Old PC:s

Hi !

I have a couple of old PC:s and I was just gonna throw them away when I
thought “What if I coud use them for Internet and other very simple tasks ?”

So, now I need to know :

What am I supposed to download for P2:s with 128 - 512 megabytes of ram
(there’s a demo right ?) ?
Where can I findd this (url?) ?
Whats the cost if I want to keep it when the demo expires ?

Thanks

/daSwede (not really a computergeek)