FaxZero allows you to send a fax to any fax machine in the United States or Canada for free.

FaxZero allows you to send a fax to any fax machine in the United States or Canada for free. You don't need a scanner or fax machine. All you do is send an email with text or attach a PDF, Microsoft Word or an Excel spreadsheet, and FaxZero will fax it. The only hitch for a free fax is that the cover page will have an advertisement on it and you can only send 2 faxes per day up to 3 pages. If you don't want the advertisement, you can still use the site but pay a $1.99 premium and send faxes up to 15 pages. They don't recommend the site for those who send mulitple faxes regularly. The site is simple, easy and smart.

FaxZero lets you send a fax to any fax machine in the United States (including Puerto Rico) or Canada for free. You don't need a fax machine yourself, but you do need a valid e-mail address.
More at:http://www.faxzero.com/