Privacy Search Engines:

DuckDuckGo https://duckduckgo.com

Startpage https://www.startpage.com

Mojeek https://www.mojeek.com

Qwant https://www.qwant.com

Special Search Engines:

Search engine for forums https://boardreader.com

Google Groups (needs logged in) https://groups.google.com/search

Netsplit IRC search https://netsplit.de/channels

Kiwi IRC Search https://kiwiirc.com/search

ISearchFrom (localized search) http://isearchfrom.com

Meta Search Engines:

Faganfinder https://www.faganfinder.com

Carrot² https://search.carrot2.org

Searx (list of instances) https://searx.space/

Metacrawler https://www.metacrawler.com