There are several programs and tools that can be used to audit websites, including:
Google Analytics: A free tool that can provide detailed information about website traffic, user behavior, and conversion rates.
Google Search Console: A free tool that can provide information about a website's search engine performance, including information about crawl errors, search terms, and backlinks.
Ahrefs: A paid tool that can be used for comprehensive website audits, including analysis of backlinks, content, and search engine rankings.
SEMrush: A paid tool that can be used for website auditing and keyword research, organic search tracking, paid search, and ad serving.
Moz: A paid tool that can be used for website audits, search engine ranking tracking, and keyword research.
DeepCrawl: A paid tool that can be used to audit websites, track search engine rankings, and research keywords.
Sitebulb: A paid tool that can be used for website audits and keyword research.
Screaming Frog: A paid tool that can be used to audit websites, crawl websites, and analyze the resulting data.
These tools can provide a wide range of information about a website's performance, structure, content, and other factors, and can help identify and fix any issues that may affect a website's search engine rankings, user experience, and overall performance.