The Linear MCP Server is a deprecated Model Context Protocol server used to integrate with the Linear issue tracking system through the MCP protocol, allowing LLMs to interact with Linear issues.

The MetaTool MCP Server is a proxy server used to connect multiple MCP servers and forward tool calls to the appropriate servers. It is used in conjunction with the metatool-app to provide GUI tool management functions. The project is deprecated, and the Node.js alternative version is recommended.

The ZBD MCP Server is a deprecated Bitcoin payment service used to add Bitcoin payment functionality to LLMs (Large Language Models). The project is developed based on the TypeScript SDK, supports handling Bitcoin Lightning Network payments through the ZBD API, and provides various payment tools and functions. Users need to migrate to the new MCP Server implementation.

A lightweight MCP server prototype created using Symfony components, deprecated but can be used with configuration adjustments

The legacy version of the Square MCP Server (deprecated), which provides access to Square API functionality. Official maintenance has been migrated to a new repository.

A deprecated PayPal integration service that provides a standardized interface for payment processing, business operations, and user management.