MaxCut - It's easy! You input the sizes and materials, MaxCut does the rest!
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Easy Cut Studio - Easy Cut Studio is a vinyl cutting software to design and cut signs, logos, lettering, shapes, and decals.
ioBroker - flexible and modular application for the IoT and Smarthome
CutList Optimizer - A free cutlist optimizer
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation