I've been looking for a free database of vehicle manufacturer's specifications, data, and images for a long time with no luck, does anyone have any ideas?
For the United States, FuelEconomy.Gov provides a seemingly comprehensive database of vehicles. You can use the API to pull down select vehicles or all vehicles in the database. In is primarily to communicate fuel economy, but a number of other vehicle features are also reported (transmission, engine type, etc.).
Full disclosure: I'm the developer of an R package aimed at extracting data from the API.
Here is a database of vehicles in the UK.
Search for statistics about every make and model of vehicle registered in Great Britain. Data comes directly from the Department for Transport, and is regularly updated.
Edmunds API has pretty decent info.
If you are looking for a quick and easy database of UK New Vehicles then The following may be of use:
It does not include images or technical data but may be a useful starting point.
Full Disclosure: I work for the company that produces this product.
Here is a database of all the car models (~230k) sold in France since 2001, including power, consumption and greenhouse gaz emissions. There are no picture though. You can download the dataset or get the data via an API. The source is the ADEME, The French Environment and Energy Management Agency who run the tests.
You'll do well to find a free database. However, I found https://www.carmakesandmodels.co.uk offers a free API. I needed a solution for a car insurance website and found this API adequate and updated monthly.
I was once using Edmunds for an app. Haven't they closed their API?? (that's what i've heard).
I did use cdbapi, too. We needed only few fields for integration,but the info was accurate.
There's a pretty good/large vehicle make and model database free(not include images) and API(paid) : Vehicle make model database download free.