Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Interfacer - Collection of more than 200+ free design resources
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.
Facebook Design Resources - A collection of free resources made by designers at Facebook
The Simple Postcard - Text a photo to mail it as a postcard
Freebiesbug - Collection of the best free web design resources.