SightSpeed is a free video and voice call softphone application that allows you to make free pc to pc voice and video calls over your broandband connection.
SightSpeed recently upgraded its software to allow you to make calls to regular landline phones and cell phones (like you can already do in Skype and Gizmo). These calls do cost money, but the costs are still lower than from a traditional home phone. You can buy “phone out” credits quickly using SightSpeed and your credit card. These credits are prepaid, so you need to purchase them in advance if you plan to use SightSpeed to make calls to regular phones.
At this time you can only make video calls to other SightSpeed users, pc to pc.