Similar to Ping_(ブログ)

Chrome Web Store

.ck

.cl

.cm

.cn

.co

Codecademy

CodePlex

Collaborative real-time editor

.coop

.cr

Craigslist

.cu

Cuil

.cw

.cx

.cy

.cz

Data URI scheme

Datagram Congestion Control Protocol

Datagram Transport Layer Security

DAViCal

.de