I know there are broken links in the Handbook, but it is not easy for me to find them. This is not a blocker, but it important for the accuracy of the Handbook and useful for the community. I investigated some options but most of the sites offering this are paid and free options are not accurate or the results cannot be exported all at once. 

One reliable solution would be Google Webmaster Tool which I used in the past*,* but it requires some verification which I not sure if/ who should proceed. 

Is there a chance to investigate this tool or any other that would let us know the broken links in the site? If there is smth available already, please let me know.

Or at least a sitemap with all the URLs would be helpful, but did not manage to get that. 

See idea - https://planet4.greenpeace.org/idea/integrate-tool-to-spot-broken-links/

Stefan from Switzerland using  Screaming Frog SEO Spider: https://www.screamingfrog.co.uk/seo-spider/ (the free version includes only 500 URLs before it stops - that includes images and anything else linked in a page)