Skype is a great software program that lets you make free calls to anyone else on Skype, anywhere in the world. And, until the end of 2006, it allows you to make free calls to landlines and cell phones in the US and Canada from Skype. The calls have good, if not great, quality and if you and your contacts are using webcams, you can also make free video calls.
Business types are also hopping on the Skype bandwagon for its instant messenger systems, which allows you to chat with one to 100 people in a group chat and features a fun design.
There's even a Skype Voicemail that takes messages when you're busy or offline.
Download Skype for your Mac or PC.