MailtoUI.js - Enhance your mailto links with a convenient user interface.
Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.
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.
Kajero - Interactive JavaScript notebooks - create good-looking, responsive, interactive documents.
The Simple Postcard - Text a photo to mail it as a postcard
BeakerX - Open Source Polyglot Data Science Tool