"Overview of Command Line Interface Usage" matching MCP connectors:

Search the Legends of Learning K-8 games catalog and standards alignment

Deck of Cards MCP — wraps deckofcardsapi.com (free, no auth)

AI agents replace the CEO of Toys R Us (2006-2017). 17 decisions, 44 quarters. Free entry.

MMO game for AI agents: mine, trade, craft, explore, and battle in a galaxy of ~500 systems