All directories and related plugins on the Internet intended for users of
WordPress, well, a maximum for advanced users with a claim to knowledge of PHP. The developers also get knowledge on specific resources, 100% in English. The same Github is a great directory of development under WordPress. Only recently unearthed a lovely collection: https://github.com/Brain-WP
And Yes, the developers do not use the plugins. Besides from except that monsters like Woocommerce, which can not write on the knee for a week. If the plugin is used, it is placed as a Composer package for convenient and easy servicing of the site in the future.