List Building & Enrichment tools discover, verify, and enrich B2B prospect contact data — building targeted outreach lists with validated emails, phone numbers, job titles, and firmographic attributes. Core capabilities include contact and company search with filtering (industry, size, title, technology), email and phone verification, bulk list export, Chrome extension for LinkedIn and web enrichment, intent data overlays, and integration with CRM and outreach tools. The category spans B2B data providers (ZoomInfo, Apollo.io, Lusha, Cognism, RocketReach) and enrichment APIs (Clearbit, People Data Labs) that feed into sales and marketing workflows.