Past Projects the Ajahn Subharo website. XMPP chat server (for family and friends). Wiki access, providing further explanation, may be granted if you ask nicely MatterMost Team Server (an Open Source Slack clone): it took dozens of hours of labour to write a tutorial explaining how to install it on a Raspberry Pi OpenWRT and Pi-Hole: It took 100+ hours to set up, then show operation of interconnected servers/services which offer a teenager-restriction-to-Social-Media solution on a home LAN, built entirely out Open Source software.