Proof - Website conversion rate optimization and visitor monitoring
Blockbutler - Real-time transaction notifications for the blockchain
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
CryptoNotify - Receive transaction notifications of any BTC or ETH address
Magnify - Push out beautiful website announcements in 10 seconds.
Notif.me SDK - A Node.js lib to send all your transactional notifications