Ghost is a open-source publishing platform focused on professional blogging with membership and newsletter features. It handles publishing, memberships, newsletters, and seo, and it's best suited for bloggers and publishers who want a clean cms. It has been around since 2013, giving it a 13-year head start in building out integrations and refining the product.

The core product is entirely free. Paid plans start at $9/mo, which unlocks the full feature set. It's aimed at individual users, so it's fast to set up but may lack team-management features if you scale.