BeWelcome - Open your door to the world!
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Trustroots - Travellers community for sharing, hosting and getting people together.
Mailjoy - Delightfully easy direct mail marketing. A DIY direct mail tool created for marketing and growth teams. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven mail campaigns.
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.
The Simple Postcard - Text a photo to mail it as a postcard