Ask HN: Is there a search engine that only returns non-commercial sites?
I.e sites that are not companies and not trying to sell anything? Presumably advertisements are ok. Millionshort is pretty neat- remove the top 1000 or top million most popular sites from the results https://millionshort.com/ This is nice, great UI too Kagi Search [1] has an optional filter for this. Sadly it's only in beta for now. This isn't a great answer, but searches like this work in Google: you.com. Been using it for technical searches and some other searches.
windows -site:microsoft.com
windows -site:.com
windows site:.org
windows site:.com OR site:.net
windows site:.com OR site:.net OR site:.co.uk