Synchronised browsing and debugging tool. Preview site on muliple mobile device without touching them.
http://joaoapps.com/
https://cwlarson.com
mydknyght
http://www.webrankstats.com/
https://developers.google.com/chrome-developer-tools/
http://viljamis.com/
https://dnsbil.com
@kennydude
http://www.tetherly.com/
http://emmet.io/
QR Hook
http://labs.iqfoundry.com/