Many valuable suggestions you may find in this post:

https://www.researchgate.net/post/How_to_find_free-to-publish_journals

See also these discussions:

https://www.researchgate.net/post/Scientific_Journals_with_Open_Access_and_no_APC_free_charges_for_authors

https://www.researchgate.net/post/Can_we_publish_articles_with_no_money

As far as I am concerned, there are plenty of journals indexed by WoS and Scopus which are free of charge. However, it depends on which line of science you are in to determine which journals might be of help in the course of your question.

Best,

You can find journals as per your choice at https://www.doaj.org/