MillionShort - A long tail search engine that lets you remove up to the top 1 million most popular websites from results - https://millionshort.com
I posted Million Short 14 years ago to HN and the search engine has been largely the same since then. Now working on a pretty major overhaul: Launching our own decent sized independent index along with some (I think) cool & useful features.
The search requires a paid account currently although I plan to post a Show HN soon that won't require any account or payment.
One idea I had for getting to the tail: filter out sites that appear to use SSO.