This is the closest thing to an android app, but it just adds a check to see if you're on your local network or not. Other than that, it's just a web frontend.
The frigate documentation also has some info about installing it as an app, but either I'm doing it wrong or it's the equivalent of a bookmark on my homescreen.
Game servers are always fun! I set up a custom Minecraft modpack and have it set up on my domain. I also run an Arma 3 server, but it's a hackjob of a self-host solution and I'm ashamed of how it works.
To address your examples directly:
Media server: Jellyfin, along with an arr stack (Radarr, Sonarr, and qbittorrent and gluetun) to automate everything for you.
Photos app: Immich is your direct Google Photos replacement. Automated uploads, object detection, facial recognition, etc, all ran locally on your machine. Just remember: you still need a proper backup!
Recipe management: Mealie is the best I've used. It can import a recipe from almost any website. Very easy to cook with and follow along each step. It also lets you categorize meals (breakfast, lunch, dinner), rate your meals, and randomly pick meals for you.
Other things I have going:
Frigate NVR - A couple PoE and wifi cameras set up around the home record everything. Frigate records and timestamps things based on the settings - A person walks up, something loud happens, etc. My only gripe is that there isn't a good Android app to go with it. I'd like to receive notifications on my phone, too.
MeTube - Rip videos from almost anything. Friend sent you an Instagram video, but you don't have Instagram? Chuck it into this and it'll give you the video. Here's all the websites it supports.
Also: Garmin recently enshittified by simultaneously adding an AI slop component that works by taking all of your recorded fitness and location data and doing gods know what with it, as well as a paid subscription tier to their obligatory smartphone app -- the latter after explicitly promising for many years that they wouldn't. So not only is their hardware expensive (and their owners are now rightly pissed), they're also liars. I would not give them any money until they shape up, if I were you. Assuming they ever do...
Gadgetbridge works with most Garmin models. I have the Instinct 2 Solar and have never created a Garmin account or downloader the app.
Your dad and your partner switch bodies. The only way to switch them back is to bang one of them.
Do you bang your partner in your dad's body or do you bang your dad in your partner's body?