Free Online Fax

Online faxing sends a fax through the internet using e-mail, instead of the phone line like a traditional fax machine. The nice thing about internet faxing is that even if you don't own a fax machine, you can still fax. It's different than just e-mail, because you can send the fax from your e-mail to a traditional fax machine. You can also receive a fax through your e-mail that is sent from a traditional fax machine. There are lots of online fax services out there, but here are a few services that will allow you to send a fax for free.

FaxZero
FaxZero lets you have two free faxes per day. If you are not a high volume faxer and just need to fax something occasionally, this is a great offer. It is basically just like sending an e-mail, only you can send it to a traditional fax machine by providing the fax number. They also send you a fax confirmation e-mail so that you know if your fax was transmitted successfully.

Drop.io
Drop.io is pretty easy to use. First you sign up for a drop.io account. Once you have an account, you just upload the document that you want to send, then, click on "Send as Fax". Enter the fax number and send it off. Pretty simple and it's free!

ScanR
ScanR uses the technology of your camera phone. You take a picture of a document you want to send to someone, then, send it to ScanR. They then send the document on by fax as a PDF file. This service does require that you download some software for more detailed services, but the basic services are free.