While not being open source, BitTorrent Inc. does promote the open standardization of the protocol[1], and employs the creator of bittorrent, Bram Cohen[2], as chief scientist.
μTorrent is, I think, the best suggestion for a client for people who need client suggestions. (having tried a large number of very mediocre competitors, free, open, or otherwise)
I usually stick to rtorrent on the commandline, but that's a shitty suggestion for helping bring awareness to hacker issues.
I was having trouble streaming the talks from defcon.org so I decided to mirror it here http://104.236.115.7/ I will probably kill the server in about a week, when load to Defcon servers go down.
The default file indexer for Nginx truncates the file names which makes it hard to find a video, but just appending the file name should play the correct video.
+1 to this. During the presentation they scan the entire internet for open VNC ports that do not require authentication. There were many found (thousands?), the most surprising being a mainframe that looked like it controlled a railway interchange. I was the guy who gave them the iPhone backdoor port ;-)
This was demonstrated at 30C3 last December as well. I still have the screenshots of the hits on the firewall logs from the various servers I had up at the time.
[1] https://www.defcon.org/html/links/dc-torrent.html