As Guest Bardford wrote, WireTap is great for Macs. Reminded by this, I tried very hard to get the free version 1.0 off the Web, but it seems it is now impossible. Ambrosia now offers WireTap Pro 1.1.3 for trial and then for purchase @ $19. As I lost my v.1 when my HD died recently, I've downloaded 1.1.3, and it is a pleasure to use.