WiseStamp turns your Gmail signature into a one-stop promotional tool. The add-on, available for the Chrome, Firefox and Flock browsers, lets you add icons, links and other information into a slick template. The result is an email signature that can contain everything from clickable social media and website buttons to contact information across a variety of electronic channels.
Display your Skype or Google Talk usernames, a button that links to your Etsy or eBay shop and icons that display your Facebook, Twitter and other social media pages. You can create one signature with a free account; paid plans start at $36/year and provide expanded templates and the option to create more signatures.