"Collabora Online" matching MCP servers:

Provides tools for AI agents to interact with the Orange Juice Online Judge API by managing problems and code submissions. Users can list problems, retrieve detailed descriptions, submit source code, and track submission status through natural language.

Enables an agent to drive a real Ragnarok Online client session against a local rAthena server, allowing it to log in, walk, talk to NPCs, and fight in order to test server content end to end.

Enables AI agents to obtain independent, Ed25519-signed receipts confirming real-world facts: whether a page is online, a domain is legitimate, an email address is deliverable, a heartbeat was declared, or a scheduled task actually ran. Each response includes a verifiable cryptographic receipt, so agents can prove to their users that an asserted outcome was observed by a neutral third party rather than self-attested.