Enveloupe - Send snail mail in three clicks.
Felt for iPhone - Handwritten cards for the modern world
Thankster - Automagically send hand written cards
Letterly - Send handwritten cards to family and friends
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.