Working with APEX? You should use the below Themes, Tools and Bolilerplates.
- Universal Theme - Official Theme shipped with APEX > 5.0 - by Oracle APEX Development Team
- Material APEX - Material Design Theme - by Vincent Morneau
- Font APEX - Icon Pack shipped with APEX 5.1
- APEX Nitro - essential APEX companion - by OraOpenSource, Vincent Morneau
- OXAR - automatic installation scripts for Oracle XE & APEX - by OraOpenSource
- Oracle Database & APEX Developer Docker Image - scripts for Docker image building - by Daniel Hochleitner
- Build an APEX Stack with Docker - scripts for Docker image building - by Adrian Png
- APEX Client Extension - build APEX desktop apps using Electron - by FOEX
- FOEX Developer Addon - browser extension to enhance APEX development env - by FOEX
- Xplug for APEX - browser extension to enhance APEX development env - by Filip Van Vooren
- Insum APEX Pro - browser extension to enhance APEX development env - by Insum Solutions, Benjamin Shumway
- APEX Test Automation Framework - by Simon Hunt
- Logger - Logging utility for Oracle DB & APEX - by OraOpenSource
- OOS Utils - Common PL/SQL utility scripts / API - by OraOpenSource
- ApexSec - automated security analysis product - by Recx
- APEX Builder Extension - browser extension to enhance APEX development env - by FOS
- APEX as a PWA - A complete guide for turning an APEX application into a Progressive Web App.
- APEX Theme Boilerplate - basic stuff that any APEX theme needs - by Vincent Morneau
- APEX Plugin Templates - Templates for common APEX Plugins - by Daniel Hochleitner
References [https://github.com/Dani3lSun/awesome-orclapex](Awesome APEX). If you see any other of useful or utility you can write to https://github.com/Dani3lSun or to me. He will add to his great awesome APEX collection directory.