Oculus Quest - An all-in-one VR system
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Microsoft Hololens - Augmented reality headset from Microsoft
ioBroker - flexible and modular application for the IoT and Smarthome
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation