Online Virtual Document Signature Service

To sign real estate documents and other contracts.

http://easysignmobile.com is currently free though they are planning on charging.

Docracy is an open source site where users can share and sign legal documents.

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2011 07 18
EchoSign's process takes the dreaded fax out of the signature process and has users send email documents through its system which takes care of the signing process on the other side. The recipients can e-sign instantly in any browser, an iPhone or a Blackberry, or via a widget on any website.
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There are 4 levels of membership. For 5 or less signatures a month, the service is free. More advanced levels begin at $15 a month.
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Adobe plans to discontinue as a result of the acquisition a cloud-based electronic signature service, called eSignatures or eSign, that it released in May last year.