You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
Kimai is a web-based multi-user time-tracking application. Works great for everyone: freelancers, companies, organizations - everyone can track their times, generate reports, create invoices and do so
UVdesk Opensource Community Helpdesk Project built for all to make a Full Ticketing Support System along with many more other features.
AdminLTE bundle for Symfony 4+ - an backend/admin theme for easy integration. It is based on the AdminLTE Template 2. Supports KNPMenuBundle and FOSUserBundle, built with webpack-encore.
FileManager is a simple Multilingual File Manager Bundle for Symfony
A self hosted server for Symfony Flex allowing private and customized recipes, proxy and caching functionality for the official endpoints.
Bootstrap Application for Symfony with Domain Driven Design
Symfony2/3/4/5 Queue Bundle (for background jobs) supporting Mongo (Doctrine ODM), Mysql (and any Doctrine ORM), RabbitMQ, Beanstalkd, Redis, and ... {write your own}
Docker Environment for Symfony. PHP-FPM, NGINX SSL Proxy, MySQL, LEMP