Search engines are listed in tables below for comparison purposes. The first table lists the company behind the engine, volume and ad support and identifies the nature of the software being used as open source or proprietary. The second table lists privacy aspects along with other technical parameters, such as whether the engine provides personalization (alternatively viewed as a filter bubble).
Many search services are not listed, including historical ones that have gone obsolete.
References
Comparison of web search engines Wikipedia(Text) CC BY-SA