For video and audio gear, https://www.rtings.com/

For lots of stuff, Consumer Reports. Online access to CR is included with many US library systems. For example, all Seattle Public Library cardholders have full access to CR’s site: https://www.spl.org/online-resources/a-z-online-resources?al...

TBH,I rather have a paid consumer review site than a free one. A free one is not trustworthy by definition, they'll be looking to make money off sponsorships and advertising, which IMO is directly at odds with the service being provided.