dialpad.com is the world's first free Java-based web-to-phone service. With dialpad.com, you can make unlimited free phone calls to anyone in the U.S. and Canada with a valid phone number. Now you can launch dialpad by clicking this button and  make free calls without leaving this web site.
	Free trial will give you up to 15 minuts to US, Canada and European countries. Best rates to call overseas.
	Free calls in USA and Canada. Call from your browser or pc (download is not necessary). You can use this service for international calls and take advantage of their discount rates
vocalcommerce.com Click here	Now your customers can contact you instantly worldwide with a single click of a PhoneButton TM which is placed on your website. (free version is advertisement supported)
MSN-messenger	Calls placed using Messenger Service 3.0 are free PC to PC or free to the 50 United States, District of Columbia, and Canada when made PC to telephone or mobile for 5minuts.
www.wowring.com	Limited to 3 calls at 2 minutes each, but you can buy base country plan included 16 countries