In case you've just written a paper and are still uncertain where to publish it (but you want to publish it Open Access, of course!), the TIB Hanover has the right tool for you: their Bibliometric and Semantic Open Access Recommender Network (BISON). It finds suitable Open Access journals based on the title, abstract, and references of your paper and, perhaps most important, is GDPR-compliant and does not store any of your data.

https://service.tib.eu/bison/