Ghost

Ghost is an open-source publishing platform designed for creators and publishers to build websites, publish content, send newsletters, and manage paid subscriptions. It provides a powerful editor for rich media, audience growth tools, and business management features, with extensive integrations and customizability through themes and APIs.

Ghost is a strong match for the Medium concept. It explicitly positions itself as an 'independent Medium alternative' and offers a comprehensive platform for professional publishers and creators. It provides a rich text editor, built-in email newsletters, membership and monetization features (including paid subscriptions with 0% transaction fees), and analytics for reader engagement. While it doesn't explicitly mention an 'algorithmic feed' like Medium's recommendation engine, it does offer search and discovery features and the ability to send newsletters, which serves a similar purpose of content distribution. It also supports community feedback tools, user profiles, tags, and integrations for social sharing and other services. The platform is designed for writers to own their content and audience, aligning well with the core value proposition of the concept.