[OnePlus 5 Guides, News, & Discussion] shadowstep:
APKs

AdAway (many devices) - XDA Thread, Download Mirror

AdAway is a utility for rooted and non-rooted users used to help manage host file entries. AdAway doesn't directly block ads; it limits unwanted ads by redirecting servers that distribute those ads to an 127.0.0.1, which returns nothing.

BetterBatteryStats (many devices) - XDA Thread, Download Mirror

BetterBatteryStats is an app that can find applications causing the phone to drain battery while it is supposed to be asleep. It provides detailed, useful information regarding kernel wakelocks, partial wakelocks, alarms, wakeups, etc.

EdXposed Manager (many devices) - XDA Thread, Download Mirror

EdXposed Manager is the companion app for EdXposed that is needed to perform various EdXposed related tasks, such as displaying EdXposed framework status, enabling/disabling EdXposed modules, etc.

Magisk (many devices) - XDA Thread, Download Mirror

Created by topjohnwu, Magisk is the currently the most popular root solution. In addition to that, it also offers a universal systemless interface to alter the system partition systemless-ly so that SafetyNet passes. Installation instructions are here.

Magisk Alpha (many devices) - GitHub, Download Mirror

Maintained by vvb2060, Magisk Alpha is a fork of the original Magisk solution. It aims to fix bugs and resolve other issues that are present in the original solution and also restores the hide functionality that has been removed from the original Magisk app. Installation instructions are the same as the original solution, linked above.

OOS Firmware Extractor (OnePlus 5/5T) - GitHub, Download Mirror

OOS Firmware Extractor can be used to extract firmware from an OxygenOS ROM zip to create a TWRP flashable firmwareupdater.zip. You can also check the MD5 hash of the ROM, extract it and check the updater-script before the flashable firmware zip is created in the root of your internal storage.

Scoop (many devices) - XDA Thread, Download Mirror

Scoop saves the stack trace of a crashing app and displays all crashes in a list so you don't have to look through a long logcat. Additionally, you get a notification on every crash which already displays the most important information.

Vanced Manager (many devices) - XDA Thread, Download Mirror

Vanced Manager can easily install and uninstall YouTube Vanced and MicroG, and has various settings for customizing installation. The app comes with an easy-to-use interface, support for background download and installation.

ViPER4Android FX (many devices) - XDA Thread, Download Mirror

ViPER's Audio is an audio enhancing software that provides a better audio experience in various platforms, such as smartphones and PCs. ViPER4Android FX is the main control app for the Android driver of ViPER’s Audio.

Warden (many devices) - XDA Thread, Download Mirror

Using root access, this open source app allows a user to disable all detected trackers and loggers contained within apps. It uses a static list of trackers and loggers compiled by French non-profit Exodus Privacy. It also features a profile-based “debloater” that supports scripting.

Wireless ADB (many devices) - GitHub, Download Mirror

In words of the author of the app, MSF Jarvis, this is a dead simple app for enabling wireless ADB on rooted devices. Add the Wireless ADB tile to your Quick Settings panel, connect to Wi-Fi, enable Wireless ADB, profit.