This document discusses tools for evaluating URLs at scale. It provides an overview of commonly used tools for backlink analysis, site migrations, site structure visualization, extracting specific data, analyzing single-page applications, and conducting content audits. Examples of popular tools mentioned include Screaming Frog, Majestic, Ahrefs, SEMRush, DeepCrawl, and RStudio. The document also provides examples of how to use some of these tools to perform initial backlink audits, site migrations, and extract custom data.