Listed below are the search engines I’m currently using. Combined, they offer a very comprehensive set of search results.
1. A Self-Hosted SearXNG Search Engine
Note that DuckDuckGo incorporates results from Bing, Yahoo, and Yandex — so these search engines are not used directly.
2. A Kagi Paid Search (With Customized Domains + Lenses)
Kagi is a subscription-based search engine. It is customized with a domain list filter + other search result customizations.
I also use Kagi Discussion Lenses and other personalized Lenses. Lenses are curated groups of websites.
3. A Neeva Paid Search (With Customized Domains)
Neeva — a private search engine — customized with a list of favored domains