Blockbutler - Real-time transaction notifications for the blockchain
Mailjoy - Delightfully easy direct mail marketing. A DIY direct mail tool created for marketing and growth teams. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven mail campaigns.
CryptoNotify - Receive transaction notifications of any BTC or ETH address
Felt for iPhone - Handwritten cards for the modern world
Notif.me SDK - A Node.js lib to send all your transactional notifications
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.