Question: Is there a search engine that offers flexible search options, including keyword and boolean operator searches, to find people on the web?

If you need a search engine that can perform flexible searches with keywords and boolean operators to find people on the web, Getlista is a good choice. It can perform keyword, boolean operator and natural language searches to find people's presence on the web and to extract contact information like email and phone numbers. The service generates detailed profile summaries and decision-ready insights, which can be helpful for recruiters and salespeople.

Another good option is Exa. This search engine uses modern models like embeddings and transformers to deliver contextually relevant results, which can be particularly useful for finding people by retrieving page content as soon as it's available and processing thousands of results. It also accepts natural language queries and has a variety of pricing levels, including a free tier.

If you need a high-performance, high-scalability search engine, Meilisearch is worth a look. This open-source search engine supports search-as-you-type, filtering, language detection and custom relevance, and returns results in under 50 milliseconds. It also has strong security features and flexible pricing options, so it can be used on a variety of platforms and applications.

Last, take a look at SonarList, which offers immediate access to information about target sites, including email addresses and LinkedIn profiles. With AI technology to crawl tens of thousands of web pages, SonarList offers real-time data and a range of features like email finder, LinkedIn profiles and semantic analysis. It has a free plan and relatively inexpensive monthly and yearly subscription plans, so it's good for freelancers, small businesses and entrepreneurs.