DummyMac is a bandwidth manager. You can limit inbound/outbound bandwidth choosing a port range. Very useful for dialup connections.. You can download with BitTorrent, surf the web e ichat without getting mad with lag and timeouts. DummyMac is a frontend for the traffic shaping module "Dummynet", included in ipfw 2, the built-in Mac OS X firewall software.
Pocket Runners
