Pebble
Used by 3 peoplefitbit.com ↗

“An unlikely hero in my daily life is my Pebble Watch.”
James T. Green Interview, Artist, designer · via Uses This 
“I've been wearing my Pebble a bit more recently, and even spent a week experimenting with getting email delivered to my wrist.”
Roo Reynolds Interview, Product manager (GOV.UK) · via Uses This 