Miniature Mail - Little letters printed on demand and sent in tiny envelopes.
Enveloupe - Send snail mail in three clicks.
MailThis - Send mail from your computer
Felt for iPhone - Handwritten cards for the modern world
The Simple Postcard - Text a photo to mail it as a postcard
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.