As far as I know, "Anthem" is the only one widely available online for free. If I remember correctly there was some sort of mix-up in the copyright. It's a great story and reminds me sort of in a strange way of Orwell's 1984, about the "sin" of thinking of oneself and not of the whole.
Some know, and some don't, about Rush's 2112 being influenced by "Anthem." Or at least that's the story. I haven't actually heard Neil Peart admitting this. He's a secretive guy. I wish I could sit and talk with that man for hours.
Check the torrents for the rest. It may not be listed singular, but rather as a collection. Look at files within the torrent listed and you'll know for sure.