"mailbox.org" matching MCP connectors:

Sourced answers to everyday "why is my…" questions — health, pets, home, plumbing, tech, cars.

Non-diagnostic child-development knowledge by Pinnacle Blooms: search, milestones, ICF crosswalk.

Food and nutrition data: search, macros, and comparisons

USDA FoodData Central nutrition data — search 1M+ foods, get full nutrition profiles (macros, vitamins, minerals), and compare foods side-by-side. Public domain government data.

Disease Twin — Brazil's rare-disease knowledge graph (10,468) over MCP. Source-grounded, PT-BR.

The Emotion Dictionary's 402 emotions: define a word, resolve a feeling, body maps. CC BY 4.0.