You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
Symfony bundle for Elasticsearch with steroids
ongr-ioFileManager is a simple Multilingual File Manager Bundle for Symfony
artgrisSymfony2/3/4/5 Queue Bundle (for background jobs) supporting Mongo (Doctrine ODM), Mysql (and any Doctrine ORM), RabbitMQ, Beanstalkd, Redis, and ... {write your own}
mmucklo