Automated Signature Technology
Automated Signature Technology is dedicated to providing the best signature reproduction equipment possible. We design and manufacturer all of the machines that we sell.
http://www.signaturemachine.com/

Zertificon Solutions
Zentrale Email Sicherheit für das gesamte Unternehmen
http://www.zertificon.de/z1_backbone_of_trust

My John Hancock
Free and custom animated e-mail signature files, also provides information on how to set up a signature file in an email client.
http://www.myjohnhancock.net/

Signature
Free, open-source producer of dynamic signatures for e-mail and news postings. Allow signing messages with a different .signature every time.
http://www.caliban.org/linux_signature.html

CyberSign
Offers signature authentification and verification solutions.
http://www.cybersign.com/

Dollz International
Learn the history of dolls from around the world. Request a doll signature or suggest a dolls signature.
http://groups.msn.com/DollzInternational/_whatsnew

Digital Signature Guidelines Tutorial
Discusses the legal implications of digital signature usage. (American Bar Association)
http://www.abanet.org/scitech/ec/isc/dsg-tutorial.html

Ultra Electronics Signature Management Systems
Ultra Electronics PMES, for the design, manufacture and support of electronic and electromechanical products and software systems for aerospace and defence markets.
http://www.uesms.co.uk

Signature Creator
Delphi forum for creating an HTML signature, using a program created for users of this forum.
http://forums.delphiforums.com/signature99/start

XML-Signature Syntax and Processing
Provide integrity, message authentication, and/or signer authentication services for data of any type, whether located within the XML that includes the signature or elsewhere (W3C Proposed Recommendation 20 August 2001).
http://www.w3.org/TR/xmldsig-core/