While setting up this website and collecting information, I found a (relatively) small number of freely available sources.
In this article I will share them with you.
Free trademark information
Let us start with two projects of the Wikimedia Foundation: Wikipedia and Wikidata. They contain a lot of useful information. We help them as well, read our article How does genericides.org give back to the community?
Gary Hoover collected a list of "most powerful brands", from the year 1923. https://data.world/garyhoov/most-powerful-brands-1923
The Open Knowledge Foundation maintains a "open product" list, with an overview of all products manufactured by a certain company https://product-open-data.com/owner/list
Similarly, you have icecat, a worldwide unique open catalog with product data-sheets https://icecat.biz/
Lastly, you can use the data of the USPTO, including the results and conclusions from the trademark trial and appeal board https://developer.uspto.gov/product/trademark-annual-xml-ttab#product-files This is of course only for the US market
There are a lot of other, paid, options available: Young and Rubicam’s BrandAsset Valuator, Interbrand, and the American Customer Satisfaction Index. I will discuss them in a later article.
Do you have interesting sources you want to add? Let me know via the contact form.