For example (just as rough proof of concept)
Research articles: Pretty much any academic library website for published stuff, arxiv.org for white papers in computer science and math, pubmed for biosciences
audio equipment: gearspace.com
Encyclopedia: Wikipedia
Thesaurus: Wordhippo.com
The idea is to avoid needing to visit a search engine. Might be a high idea.
I use https://fmhy.net/
Anything else can be found in lemmy or reddit in a search engine.
Sadly, it seems duckduckgo and startpage are getting more corrupt by whatever private equity that Bought them.