Socialkeeper - Cultivate your friendships
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
FaceCat - Chat anonymously with your friends
Felt for iPhone - Handwritten cards for the modern world
Bond - A simple app that reminds you to keep in touch with people
Inkpact - Send genuine handwritten messages in just a few clicks