On my opinion, every Delphi coder should have such things installed in its IDE:

CnPack
IDE Fix Pack
DDevExtensions

You have to add "android:requestLegacyExternalStorage="true"" in the AndroidManifest.template.xml

How to edit /etc/hosts file in Android Studio emulator running in nougat? - Stack Overflow

Mobile Permissions Component for Android (embarcadero.com)

https://github.com/adrianosantostreina/MobilePermissions/

This component has as main purpose, to facilitate the request of resource permissions on Android. With just a few lines of code it is possible to facilitate this work in mobile Android applications.

OnGuard for FMX (embarcadero.com)

http://www.turbopack.net

Library to create demo versions of Delphi and CBuilder apps: time-limited, feature-limited, limited to num of uses or num of concurrent network users.Supported on platforms: Windows, OS X, iOS, Android

DelphiMessageBus (embarcadero.com)

https://thsoft.pl

Message Bus Pattern for Delphi. Send (publish) Message of any type in one place and receive it (subscribe) in many places.

QRCode supported Arabic text:

DelphiZXingQRCodeEx/DelphiZXingQRCodeTestAppMainForm.pas at master · MichaelDemidov/DelphiZXingQRCodeEx · GitHub

DelphiServiceManager

Service manager classes by Gurus Ritsaert Hornstra and Darian Miller. I (Tommi Prami) did some tweaking and refactoring. Slapped on premissive MIT licence if no objections (Original didn't have any).

https://github.com/TommiPrami/DelphiServiceManager

Tip: If you use the Offline Installer, RAD Studio will not be able to access the GetIt Package Manager until you manually switch to "online mode". To do this, we recommend using the GetItCmd.exe tool: GetItCmd.exe -c=useonline

Download links:

You can download the 10.3.3. version via:
30896 RAD Studio, Delphi, C++Builder 10.3.3 ISO (embarcadero.com)

You can download the 10.4.1. version via:
WEB: https://altd.embarcadero.com/download/radstudio/10.4/RADStudio-10-4-1-esd-1461.exe
ISO: https://altd.embarcadero.com/download/radstudio/10.4/radstudio_10_4_101461a.iso

BDE Installer for RAD Studio, Delphi, C++Builder 11.0 Alexandria – Downloadly - DID NOT TEST

FireMonkey Platform Services - RAD Studio (embarcadero.com)

Deploying Windows 10 Apps Through the Microsoft Store (embarcadero.com)

anders_melander / better-translation-manager — Bitbucket - for multilingual applications

DelphiPraxis · GitHub - interesting Delphi libraries

Delphi-WebMocks