Telepat.io Cloud - Open source, real time API platform

Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.

Mashape API Platform - Distribute, Monetize, Manage and Consume APIs

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.

Emburse Expense Card API - The first card API platform with app integrations

The Simple Postcard - Text a photo to mail it as a postcard