You can build your own database for marketing, business, recruitments, lead generation, and for some other useful purposes by using these web crawling tools.
Yes, you can use the scraping tool, Web Scraper, for multiple sites and pages - This web data extractor can extract targeted leads data from Websites - Yelp Scraper
LinkedIn Data Extractor is the best and trusted LinkedIn Email Scraper for extracting talented candidates' data from LinkedIn - LinkedIn Recruit Extractor - LinkedIn Scraper
Get Best LinkedIn Scraping Tools to Automate your targeted leads Collecting from LinkedIn - Linkedin Leads Extractor - LinkedIn Email Marketing - LinkedIn Email Scraper
LinkedIn and Sales Navigator is the most effective B2B sales prospecting method - Scrape targeted business leads data from LinkedIn and sales navigator - Linkedin Scraper
This email crawler only provides you the email address lists that qualify for the criteria you set. It means you will pay for only targeted and valid emails, not for fake and spam emails.