vehicles

https://github.com/vehiclesdb/vehicles

vehicles ships a curated, bundled dataset of car makes and models (with kind and body type) and a delightful, Rails-friendly API for vehicle dropdowns, search, and validation. No API keys, no network calls, no database table — the data lives inside the gem and just works. It also acts as the SDK for the hosted VehiclesDB API. Code is MIT; the bundled data is CC-BY 4.0 (derived from RDW Open Data).