LCM Source Code:
(short | long)_lcm_description.pdf

https://code.google.com/p/lcm [1]

https://code.google.com/p/lcm/wiki/Documentation [2]
svn checkout: 
https://lcm.googlecode.com/svn/trunk/lcm-read-only [3]

Website Source Recorded Sensor Data:
darpa_lcm_vehicle_log_description.pdf

http://grandchallenge.mit.edu/wiki/index.php?title=PublicData [4]

LCM Network Utility bot-lcm-utils.

This utility tunnels LCM between networks: http://code.google.com/p/libbott/ [5]

for git clone https://code.google.com/p/libbot/ [6]

UPD Multicast Configuration:
http://lcm.googlecode.com/svn/www/reference/lcm/multicast.html [7]