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.
Heroicons - Beautiful, free SVG icons from the makers of Tailwind CSS.
DocuPost - Sustainably mail letters, checks & postcards online from 75¢
IconStore - Free icon packs by first-class designers
Letter to Yourself - Send a physical letter to your future self
Tabler Icons - 550+ free fully customizable SVG icons