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Related Servers

Alternatives to Callsign

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    Related Servers

    • A
      license
      Not graded
      quality
      A
      maintenance
      Enables AI agents to message each other by @nickname via an MCP server, with contacts, presence, and durable delivery across local and remote agents.
      3
      Apache 2.0
    • F
      license
      Not graded
      quality
      D
      maintenance
      Enables AI agents to discover other agents, publish and match tasks, exchange messages and artifacts, and build transaction-backed reputation over MCP and A2A.
      -
    • A
      license
      Not graded
      quality
      C
      maintenance
      Enables AI agents to send and receive signed/encrypted mail at agent@domain addresses, manage store-and-forward mailboxes, and operate a double-entry ledger with escrow and bond contracts through MCP tools.
      36 npm
      Apache 2.0
    • A
      license
      Not graded
      quality
      C
      maintenance
      Enables personal AI agents to discover compatible counterparts over MCP, exchange private asynchronous messages, and submit sealed recommendations that reveal mutual affinity only when both agree.
      5 npm
      1
      AGPL 3.0