https://gigablast.com/ (Main site and live demo)
Licence: Apache 2.0
Docker: ? Could not see one
The search results are very good. The maintainer was a key search engine developer at Infoseek in 1997.
Considering the amount of censorship and how it is becoming ever worse, we desperately need some Free Software search engine that the average person can deploy and use. This is a priority for me.