ioBroker - flexible and modular application for the IoT and Smarthome
Kodi - Kodi is an award winning free and open source media player that got its start on the Xbox console.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Emby - media server for personal streaming movies tv music photos in mobile app or browser for all devices android iOS windows phone appletv androidtv smarttv and dlna.
Domoticz - Domoticz is a lightweight Home Automation System
Universal Media Server - Universal Media Server allows you to host your entire library of video, music, and pictures, and broadcast them conveniently to a wide variety of different devices.