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.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
DocuPost - Sustainably mail letters, checks & postcards online from 75¢
Freepik - More than a million free vectors, PSD, photos and free icons. Exclusive freebies and all graphic resources that you need for your projects
Letter to Yourself - Send a physical letter to your future self
Font Awesome - Font Awesome makes it easy to add vector icons and social logos to your website. And version 5 is redesigned and built from the ground up!