Built It Shortcodes Addon plugin is the most powerful and clean code addon plugin for the WP Bakery Page Builder.
Demo: https://codecanyon.net/item/built-it-wp-bakery-page-builder-extensions-addon-formerly-for-visual-composer/32950233
Neon is a powerful yet simple PHP Script for online voting. It has a clean and minimal design that can make a great user experience and also is built with Slim Framework and MySQL.
Demo: https://codecanyon.net/item/neon-online-voting-system-built-with-slim-framework/24380828