To give a brief overview about the devices and operating systems/tools I am using I am sharing with you the following table:

NotebookLenovo X270Fedora Linux
SmartphoneGoogle Pixel 4aLineageOS
SmartwachAmazfit BIPCustom/Gadgetbridge
MediaplayerRaspberry Pi 4LibreELEC
Music PlayerRaspberry Pi 3 with HifiBerry CardVolumio
3D-Printer Creality Ender 3Controlled by Octoprint
KitchenscreenRaspberry Pi 4 / Iiyama 24” Touch Screen LineageOS for Raspi by konstakang
Kids MusicplayerRaspi3 Phoniebox Software
MediaserverVirtual machineminidlna on Debian Linux
CloudVirtual machineNextcloud on Debian Linux
MonitoringVirtual machineZabbix on Debian Linux
DNS/FilterVirtual machinePi-Hole on Debian Linux
Password SafeVirtual MachineBitwarden on Debian Linux
VM ServerHP Microserver Gen10VMWare ESXi 6.7
Video ConferencingVirtual machineJitsi on Debian Linux
Main RouterTurris OmniaTurris / OpenWRT
Access PointTP-Link TL-WDR4300OpenWRT
VPN ProxyVirtual MachineSquid with OpenVPN and Mullvad on Debian Linux
Tor ExitsVirtual MachinesTor on Debian @ netcup ISP
All servers and devices run free software and are powered by green energy