Thankbot - Drive more business with handwritten notes
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Letterly - Send handwritten cards to family and friends
Send Mail Get Mail - A postcard-sending website.
Cards - Cards is easy. You can store there you credit cards, ATM cards and bank access details.
Postacard - Text a photo to send it as a postcard for $3.