Here is a list of keyword tools which are very helpful if you want to optimize your Amazon listings ore if you are searching for products with demand for selling.
Free Keyword Tools
Paid Keyword Tools
Hope this helps you a little bit finding the right keywords for your project. This is not a complete list and will expand in the future as I find new sites and programs. So check back regularly or sign in at the bottom of the page to get notified!
If you have cool keyword sites or tools to share drop me a message and I would be happy to complete this list with your suggestion!
Thank you very much,