open-seo

It is an open source alternative to platforms like Semrush and Ahrefs, focused on audits, keyword research, backlinks and Google Search Console data, with MCP integrations. It shows how agent and MCP infrastructure can become a concrete vertical product. For agencies, it is a reusable base for building their own SEO tools or specialized SaaS services. Watch the cost: hosting it is free, but the data comes from DataForSEO, a paid API with prepaid credits. Indexed and credited to every-app; it lives in the original repo.