GPT Crawler is a tool that generates knowledge documents from one or more URLs to create custom GPTs. By providing URLs to the Builder documentation, you can quickly generate a customized GPT. The tool will scrape the documents and generate a file which you can use as the basis for your custom GPT. You can try it out by asking about integrating Builder.io into your website. Please note that you may need a paid ChatGPT plan to access this feature.