MCP Toolbox for Databases is an open source MCP server for databases.

One governed graph for AI agents — GraphQL + MCP over your databases, files, APIs, and code

Chat2DB is a free, cross-platform, local-first database client and SQL workspace for developers, DBAs, analysts, and data teams. Connect to 40+ databases, manage data, edit and run SQL, and use your own AI model to generate, explain, and optimize queries. Available on desktop, web, Docker, and CLI, with MCP support.