Inkly - send real printed cards with your own handwriting inside
Felt for iPhone - Handwritten cards for the modern world
Notif.me SDK - A Node.js lib to send all your transactional notifications
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Cardlet - Rediscover the magic of card giving
Thankbot - Drive more business with handwritten notes