Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Letterflix - Send letters and snail mail online to the USA, Europe, India, or anywhere in the world. Letterflix is the easiest and secure way to send letters and snail mail anywhere in the world from the comfort of your home.
Handwriting.io - Real handwriting without the pen – no robots, all software
Letter to Yourself - Send a physical letter to your future self
Future Me - Send an email to your future self
DocuPost - Sustainably mail letters, checks & postcards online from 75¢