I’ve seen that bunch of people, especially young rising composers are looking for links to trailer houses and sync services and places to submit and sell your music.
This is my hand picked selection of (100+) publishers and platforms that may or may not accept your music.
This bookmark package contains most of the mayor houses and labels that accept music so you can always “give them a try”.
It is easily imported to any browser and it will be updated with new links from time to time.
Enjoy it and good luck with your submissions.
NOTE: most of the links lead directly to submission pages or FAQ pages with direct emails and such useful stuff. It may happen that some publisher closes the door for submissions but trust me just be patient and just send your best music.