Minimalistic but full-featured address book in your web browser.
adx is a standalone and portable web app (online and offline).
Contact Management, portable, small (<200KB), lightweight, contact tagging, geo mapping, web accounts, trigger phone/Skype calls, etc.
vCard (as file or QR code via offline generator), embedded Microformats (hCard 1.0, XFN).
HOW IT WORKS
Your address-book (XML file) is transformed in your web browser (via XSLT) to a full-featured web application (HTML).
Web browser for viewing online or offline (some like Chrome need a small command line parameter for offline viewing); no server, plugin or anything else needed. Any text editor can be used for contact editing (addressbook.xml).
These details are provided for information only. No information here is legal advice and should not be used as such.