I don't know that there is a way to track outgoing links if they're hardlinks.. they've gotta be pumped through a script to be tracked out going, and for productivity tracking you're going to have to pump all outgoing links through a script also. Anyway..
Arrow Trader eXtreme:
http://www.arrowscripts.com/
UCJ:
http://adultwebmasterinfo.com/ucj/
For free..
CJOverkill:
http://cjoverkill.icefire.org/
TTT:
http://turbotraffictrader.com/ ( not sure if this one can do hardlink tracking )
Search the boards a bit and you'll find many more, but those are 4 of the most popular.