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I am aware of the this link but it's not being updated https://project-gc.com/forum/read?9,109
Also, using the Challenge checkers tool, if you leave country blank and add this text to the search string "not a checker" (with the quotes) it will provide a list. But, it does not provide a current list. For example this link is not on there https://project-gc.com/Challenges//48641 so how do I find a current list of these helpful tools?
There is no direct link, as such, but they are easy to find.
Go to the main checker page (Tools > Challenges > Challenge checkers). Set the country to none and enter "not a checker" (including speech marks) in the search field.