Blockbutler - Real-time transaction notifications for the blockchain
Ethereum Live - All the latest updates on Ethereum
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
Instapush - Instant notifications for transactions that matter.
Pragma - The home base for Ethereum developers.