SEO & Search Optimization Tools

Open source SEO tools for keyword research, rank tracking, backlinks, and site audits — self-hosted alternatives to Semrush and Ahrefs. Updated Sept 2026.

OpenSEO

21,2192,717

Open source alternative to Semrush and Ahrefs — keyword research, rank tracking, backlinks, and site audits, with a built-in MCP server for AI agents.

9/20/20262717 contributors