If I had to pick some of my favorites:

• BuzzKill, Gives you total control over your notifications. I use it to auto clear apps that think they need to have a persistent notification like VPNs, Smart Watches, etc.
• DuckDuckGo, For their very useful, (In my opinion) app tracking protection proxy that they have built into the app.
• GAMEYE, For tracking my physical games collection and my extensive Amiibo collection.
• Grayjay & Revanced , For when I want to watch YouTube on mobile.
• Image Toolbox, Great for doing a whole bunch of different things. Works especially well for image related tasks, but does more stuff than that too.
• LocalSend, Airdrop but cross platform and open source. Really good.
• Privacy, An app that links to your bank account and lets you make virtual cards to obfuscate your real debit card. Super useful as well for setting up with subscriptions so you can just turn the individual card off instead of having to go find the subscription cancel option for each service.
• p!n, A very simple app that adds a quick actions menu button to pin a notification. I use it to essentially add reminders and notes to my notifications real quick.
• rdx, A simple Reddit viewer for when I have to view a Reddit link for any reason. shudders
• Shortcut Maker, Super useful app for when I’m not using Niagara Launcher. Let’s you make home screen app like shortcuts for a wide variety of things, including going to specific settings, launching specific sets of apps, and way more. Used to be my favorite app before I got into Niagara.
• URLCheck, Acts as a middle man after I click a link, telling me a bunch of info about it before letting me pick which browser I want to open it in.
• Niagara Launcher, my launcher of choice. Not for everyone, but I have found it makes navigating my phone super fast. I have tried so many different ones, but the fact that the app drawer is always on open on the home screen and I can navigate to each letter quickly made it the best for me.

Anyway yeah, those are some of the ones I use frequently. Sorry for not linking to them, but it would have taken forever lol.