What is the best tool to crawl a site with millions of pages?
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I want to crawl a site that has so many pages that Xenu and Screaming Frog keep crashing at some point after 200,000 pages.
What tools will allow me to crawl a site with millions of pages without crashing?
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Don't forget to exclude pages that don't contain the information you are looking for - exclude query parameters which just result in duplicate content, system files, etc. That may help to bring the amount down.
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Only basic stuff: URL, Title, Description, and a few HTML elements.
I am aware that building a crawler would be fairly easy, but is there one out there that already does it without consuming too many resources?
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For what purpose do you want to crawl the site?
A web crawler isn't really hard to write. In 100 lines of code you can probably code one. The question is of course: what do you want out of the crawl?
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