Pretty standard, but Google Keep. It’s great for sharing lists (shopping travelling etc.). I like how you can pin a list to the top and also the check boxes.
I use this because it allows me to tag my partner into notes, that and it being free.
I use Obtainium to keep a lot of rtuff up to date on Android.
F-droid is great, but Obtainium allows me to keep everything up to date and get it directly from the developers.
For my Retroid Pocket 3 Plus Obtainium has been so good at keeping my emulator hoard up to date.
Never even considered that. But, my handheld is an older one that doesn't run Android. I'll remember that next time I'm looking for an upgrade.
Netguard.
Gives per app connectivity options.
Kvaesitso
A very different concept for a launcher. It's very widget focused.
Syncthing. It allows you to simply sync folders between multiple Phones / PCs over the network. It works really well and kinda made cloud services obsolete for a lot of usecases.
This fastest and most convenient launcher ever:
This is always the first app I install on every new phone I purchase.
Any tangible battery improvement?
It's maybe a niche thing, but I use Unifed Remote a lot. It runs easily as little server on my various computers, and let's me use my phone and smart watch as a control for them. Mostly used to control media (watching movies, adjusting white noise volume for sleep) but also work (controlling presentation, etc). It's has various remotes from keyboard and mouse to just a simple media start/stop/volume/etc up to a remote screen display.
I sure there's other apps out there that are similar, but it's always just worked for me and seems simple enough for what I do. I paid for the full version (not sure if I even use any paid features, the basic had most of what I use) but if there's a good Foss alternative out there I'd be happy to try it!
Allows you to resize images and arrange them on a page to print. I use it to print coloring pages for my kid.
RethinkDNS
Help me to give more control on my Android, configuring a firewall, VPN and canceling acess some apps to internet.
Findroid - For watching and syncing my Jellyfin library to my phone to watch films and TV on my commute.
Newpipe - I use to sync YouTube videos offline and background play etc.
Spectdroid - I'm a sound designer and having quick access to spectral info is great.
Mini Piano Pro - Always using this to check what key a track is or what a note is.
Fitbit - I use this to track my macros for my weight training.
Kiwi Browser - Browser with Adblock and chrome plugins. I guess I use this a lot to access the front end management apps on my home server.
Genius Scan - Really good pdf scanner.
Tuner (Boss) - Guitar tuner.
Total Commander - Good file manager for my network.
Termux - Terminal emulator.
I think those cover the jist of the question. I like apps like Ampere but don't think they quite fall into the category you're enquiring about. I imagine the niche side of your request would put Spectdroid as number one, a bunch of the others are pretty obvious after rereading your question.
Setting up a Pi-hole is on my TO-DO list, but meanwhile I can't live without Blokada 5 to get rid of ads, and also LibreTube.
I'm using AdAway on all my Android devices for ad blocking. Can't live without it.
Macrodroid, hands down. Lets you automate almost everything on your phone (and not on your phone), and it's remarkably friendly to use.
Tick Tick, best reminders app I've tried (and I've tried a lot)
Here are some of my favourite apps
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