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Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
ioBroker - flexible and modular application for the IoT and Smarthome
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.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
The Simple Postcard - Text a photo to mail it as a postcard