SpringerOpen: SpringerOpen offers a wide range of open-access journals across various fields. They provide high-level peer-review and production processes to ensure the quality and reliability of your work.
AIJR Publisher: AIJR Publisher offers free paper publication in several international refereed journals with open access. They have various rapid review options for faster publication.
Journal Search: Journal Search provides a list of free publication research journals indexed in Scopus and Web of Science. These journals are open access and cover a wide range of scientific disciplines.
The here mentioned journals do offer free publication options. However, it's always a good idea to double-check the specific journal's policies, as some open-access journals may charge article processing fees (APCs) or other fees under certain conditions. Here are the links again for your convenience:
SpringerOpen: SpringerOpen
AIJR Publisher: AIJR Publisher
Journal Search: Journal Search
Make sure to review their submission guidelines and author requirements to understand any potential costs or conditions.