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Related Servers

Alternatives to Callsign

No user-submitted related servers found.

    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
      C
      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
      B
      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.
      1,006 npm
      Apache 2.0
    • A
      license
      Not graded
      quality
      B
      maintenance
      Enables AI agents to request and exchange consent-gated, end-to-end encrypted messages after owner approval, with post-quantum handshakes, proof-of-work spam protection, and public ledger auditing.
      1
      Apache 2.0
    • A
      license
      Not graded
      quality
      C
      maintenance
      Enables AI agents that speak MCP to obtain identities, exchange direct messages and threaded replies, check inboxes, long-poll for new messages, and manage agent access across a shared hub.
      MIT