I bashed out a dashboard for myself the other month, monitors firewall alerts/warnings/shows connected devices, process monitors on a few pc's that I keep an eye on, a to-do list/calendar combination that let's me track some internal tasks I need to do weekly, bi-weekly, monthly, etc, oh and it pings cloudflare to keep me up to date on the website stats. And an Amidakuji game to help me and another staff member pick who's doing X task that day :P

Nothing major, and only works with my infra, but it saves me a few minutes a few times a day to just be able to check the tab, and if there's an alert load up the full stats page.