For anything outside of gnutella, you really need to upgrade to OSX to get such options such as bit torrent. The only other alternative I can think of is Myster http://www.mysternetworks.com/ but that network is quite small. But was still active last year when I tried the program last. I used Myster before using LW 4-5 yrs ago. There's still an OS 9 version available. AFAIK the program stopped development a couple of years ago.