Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Plume - App for writing documents, scripts, books and more.
ioBroker - flexible and modular application for the IoT and Smarthome
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation