MailtoUI.js - Enhance your mailto links with a convenient user interface.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
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.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
The Simple Postcard - Text a photo to mail it as a postcard
Make.com - Tool for workflow automation (Former Integromat)