[Google Pixel 8 Pro] Justadudeinspace:
So the only mods I have found beyond the unique app finds like FlashDim and the Pixel Launcher ($5.00 but totally worth replacing the OG Pixel Launcher because it has tons more options such as a conversion with Smartspacer--Shizuku required) is the LOT of Shizuku Apps.

Apps​

Audio​

RootlessJamesDSP - An implementation of the system-wide JamesDSP audio processing engine for non-rooted Android devices GPL-3.0 (Source code)

Automation​

PhoneProfilesPlus - Allows automatic or one-click configuration of your device for specific life situations Apache-2.0

Communication​

TxtNet-Browser - An app that lets you browse the web over SMS GPL-3.0

Vendetta-Manager - Patch manager for the Discord Vendetta mod OSL-3.0

Customization​

AAAD IAP 💰 - Downloads popular Android Auto 3rd party apps and installs on Android Auto Proprietary

AmbientMusicMod - Port of Now Playing from Pixels to other Android devices GPL-3.0

Android-Screener - A tool for easily adjusting screen resolution and frame rate MIT

Android-Show-Taps - Show customized taps upon touches GPL-3.0

AutoDark - A small Android app to let you schedule dark mode On/Off MIT (Source code)

AutoDND - A simple tool to toggle DND automatically when using specified apps AGPL-3.0 (Source code)

Better Internet Tiles - Bring back Wi-Fi and mobile data tiles on Android 12 or higher + a better unified internet tile GPL-3.0 (Source code)

CarrierVanityName - Carrier Vanity Name is a very simple app to change the carrier names on unrooted Android devices GPL-3.0

ColorBlendr - An application to modify Material You colors of your device GPL-3.0

DarQ - DarQ provides a per-app selectable force dark option for Android 10 and above Apache-2.0

Language-Selector - Allows users to select individual app languages (Android 13+) Apache-2.0

LinkSheet - Restore the Android <12 Url-App-Link-Chooser with Material3 Modified MPL-2.0

NoPopping IAP 💰 - Auto Do-Not-Disturb mode Proprietary

Repainter IAP 💰 - Install custom Material You designs on your device Proprietary

ShizuTools - Contains some easy-to-use tools to go beyond the level of control allowed by Android System No license

System UI Tuner - View and modify hidden settings on Android devices MIT

TapTap - Port of the double tap on the back of the device feature from Android 12 to any Android 7.0+ device GPL-3.0

Taskbar - Use a start menu to access apps. Shizuku can unlock additional features Apache-2.0 (Source code)

Development utilities​

AndroidAccounts - Dump package names of apps that have registered an account for a user. No license

AndroidLowLevelDetector - Detect Treble, GSI, Mainline, APEX, system-as-root(SAR), A/B, etc. Apache-2.0 (Source code)

Cosmic-IDE IDE for JVM development. Uses Shizuku for an embedded shell - GPL-3.0

CurrentActivity - A current activity monitor GPL-3.0

get_event - Read /dev/input/event* No license

LibChecker - An app to view libraries used in apps on your device. Uses Shizuku to determine the install source of other apps. Apache-2.0

LogFox - Yet another logcat reader for Android GPL-3.0

Logra - Material You logcat viewer for Android GPL-2.0

RootActivityLauncher Paid 💰 - Launch/interact with (un)exported activities, services, and receivers. Supports Shizuku alongside root. Proprietary (Source code)

SensorsOff - Enable/Disable device sensors via quick settings Apache-2.0

TakoStats IAP 💰 - FPS and performance overlay with detailed real-time system information Proprietary

wireless-adb-switch Widgets & quick settings tile to toggle wireless debugging (with KDE Connect integration) - GPL-3.0

Entertainment​

Aniyomi - Tachiyomi fork with anime support and plugin management using Shizuku. Apache-2.0

Mihon - Manga reader with plugin management using Shizuku. Independent successor of Tachiyomi. Apache-2.0

Mihon/Tachiyomi has several other active forks, including TachiyomiSY and TachiyomiAZ

LOModInstaller - Mod manager for the game 'Last Origin' No license

pf-tool - Easily import and share Polyfield maps MIT

translatefgo - Fate/Grand Order game translation project CC BY-NC-SA 4.0

File management​

AirData UAV - Drone flight analysis and fleet management platform with access to /Android/Data Proprietary

FV File Manager - File manager to access Android/data and Android/obb Proprietary

MT Manager - Split-screen file manager. Can install APKs and access Android/data and Android/obb using Shizuku Proprietary

X-Plore - File manager that can access Android/data and obb using Shizuku Proprietary

ZArchiver IAP 💰 - Archive management program. Supports editing files using Root/Shizuku. Proprietary

Installer & app stores​

AuroraStore - An open-source alternative to Google Play Store with privacy and modern design GPL-3.0 (Source code)

Droid-ify - Material F-Droid client GPL-3.0 (Source code)

fdroid_shizuku_privileged_extension - F-Droid Privilege Extension that works with Shizuku Apache-2.0 (Source code)

ffupdater - FFUpdater: Updater for privacy-friendly browser GPL-3.0 (Source code)

InstallWithOptions - Simple-ish app using Shizuku to install APKs on-device with advanced options MIT

IzzyOnDroid - An unofficial client for IzzyOnDroid F-Droid Repository GPL-3.0

Obtainium - Get Android App Updates Directly From the Source GPL-3.0

PI - Package installer that allows overwriting the package requester and executor MIT

SAI - Android split APKs installer GPL-3.0 (Source code)

skydroid - A decentralized domain-based App Store for Android GPL-3.0

Miscellaneous​

Amarok-Hider - Amarok: Hide your private Files and Android APPs with just one click. Apache-2.0 (Source code)

Anywhere - An activity and shell shortcut folder Apache-2.0

aShell - A local ADB shell for Shizuku powered android devices GPL-3.0

aShell You - Material You Redesign of aShell app. GPL-3.0

Batt - A simple app that shows battery status information on Android 14 and later. GPL-3.0

DSU-Sideloader - A simple app made to help users easily install GSIs via DSU's Android feature. Apache-2.0

dualapp-mediastore-compatibility - Fixes MediaStore & File IO compatibility issues between HostProfile App and WorkProfile/DualApp/MultiApp. No license

EDS Full - Encrypted Data Store Full Paid 💰- Virtual disk encryption software for Android which allows you to store your files in an encrypted container. Wide, rich range of features for root and non-root, too many to list here (see site). Shizuku control via Android intents (see FAQ). Proprietary

EDS Lite - Encrypted Data Store Lite - Free version of EDS Full. Limited features but still robust. Non-root and root funcionality. Non-mounted mode only (see site for description). GPL-2.0 (Source code)

KeyMapper - An Android app that changes what the buttons do on your devices! GPL-3.0 (Source code)

Lemmy Redirect - A simple app for automatically launching fediverse links in your preferred Lemmy client. MIT (Source code)

LSPatch - A non-root Xposed framework extending from LSPosed GPL-3.0

Mastodon Redirect - A simple app for automatically launching fediverse links in your preferred Mastodon client. MIT (Source code)

NaiveproxyForAndroid - A simple application to run Naiveproxy on Android MIT

RealMouse - Control the mouse using a virtual touchpad. Designed for secondary displays. Proprietary

rebootmenu - Lock the screen or open the power menu using shortcuts. Useful if your power button is broken. MIT

ScreenOff - Turn off your Android's screen without entering standby/sleep mode Proprietary

SDMaid-SE - SD Maid 2/SE is Android's most thorough cleaning tool GPL-3.0 (Source code)

SecondScreen - Better screen mirroring for Android devices Apache-2.0 (Source code)

Show taps Ads - Displays the location of touch events on the screen Proprietary

SimpleWear - A simple app for controlling your Android devices from your WearOS watch Apache-2.0 (Source code)

SwiftBackup IAP 💰 - Swift Backup can backup your important data in minutes Proprietary

XtMapper - Keymapper for Android x86 GPL-3.0

Network​

CellReader Paid 💰 - Can read cell tower info on Android MIT (Source code)

PrivateDNSAndroid - Quick settings tile to switch active private DNS server MIT

WiFiList Paid 💰 - View your saved WiFi passwords on Android 11 and later without root Proprietary (Source code)

Software management​

App Ops Ads IAP 💰 - Manage application permissions without root Proprietary

Blocker - Enable/disable Android components such as activities, services, receivers, and providers Apache-2.0

Canta - Uninstall any app without root LGPL-3.0

DisabledLauncher - Android app that disables unused apps while still allowing convenient access to them MIT

FreezeYou - Improve your device's speed and battery life by freezing crappy software manually or semi-automatically Apache-2.0 (Source code)

Hail Freeze, hide or disable any app. Create and organize app groups that can be frozen with one click. - GPL-3.0 (Source code)

Ice Box IAP 💰 - Freeze or hide apps using Shizuku Proprietary

Inure App Manager 15-day trial Paid 💰 - Android app manager for both rooted and non-rooted devices GPL-3.0 (Source code)

Insular - Complete FLOSS fork of Island Apache-2.0 (Source code)

Island - Isolate and clone apps for privacy protection and parallel running Apache-2.0 (Source code)

Package Manager - A highly powerful app to manage both system and user apps GPL-3.0 (Source code)

UpgradeAll - Check updates for Android apps, Magisk modules and more! GPL-3.0 (Source code)

Vendor-specific​

Google Pixel​

pixel-volte-patch - Enable VoLTE on Pixel 6 & 7 with LG U+ GPL-3.0

Smartspacer - Customizable widget, can upgrade the built-in 'At a glance' widget on Pixel devices using Shizuku GPL-3.0

Samsung OneUI​

Hex Installer: OneUI themes IAP 💰 - Custom system-wide theming engine for Samsung OneUI devices Proprietary

SMTShell - Privilege escalation exploit (CVE-2019-16253) to system user access (UID 1000) on non-rooted devices running up to OneUI 5. Uses Shizuku for automation LGPL-2.1

MIUI​

AppLock - Prevent apps from being killed by side slide or one-click cleanup on MIUI 12+ GPL-3.0

FiveGSwitcher - 5G shortcut switch for MIUI GPL-3.0 - (Source code)

FxxkMIUIAd - Turn off MIUI ads with minimal cost Apache-2.0

Mi-FreeForm - Display most apps in the form of freeform on MIUI GPL-3.0

Unlisted apps​

To keep the main list clean, all apps that do not meet certain requirements are stored on a separate page: UNLISTED.md

I'm also using an automated crawler that searches for new projects making use of Shizuku across GitHub and several F-Droid repos. You can view the current auto-generated crawl report here: TODO.md.

Development libraries​

Core​

Shizuku - Shizuku system server, API, and app Apache-2.0

Shizuku-API - Developer documentation for Shizuku and Sui, including examples Apache-2.0

Filesystem​

nextgenfs -Shizuku compatible android/data access from Xamarin - AIDL library MIT

Power​

PowerAct - An Android library that can manipulate power-related actions with just a few lines of code Apache-2.0

Similar projects​

Dhizuku - Shizuku-inspired app that allows sharing DeviceOwner permissions to third-party apps GPL-3.0

Source: timschneeb / awesome-shizuku

EDIT: There's also Wavelet, which I use the unpaid version to boost the audio in my Bluetooth headphones through Equalizers (Pretty Functional, includes Bass Boost, Treble Boost, and more).

Anything beyond the above finds are most likely just going to be unique app finds. I've obviously been asking the same question as I've been on the hunt for Non-Root custom options. This is all I have found so far. I also use some other apps that probably deserve a mention just for uniqueness.

CloudStream - which is a FOSS media platform--movies, TV, xxx, etc. (Really worth it)

Bugjaeger Premium - (from my personal collection) is an app for tethering android to android while using platforms-tools (adb and fastboot).

System Power - is an app I absolutely love. Rooted phones get extra options but it allows quick access to the quick settings through a toast like pop-up.

MiXplorer - (link from my personal collection) File Manager always deserves a mention just because it's awesome.

That's about all I have at the moment...