Qwant was my default for quite awhile before Kagi and their results were better than DDG, by far. They have had their own index for quite sometime, and will back-fill with Bing (iirc) if they have very few results, and Ecosia is just Bing, that's about it.

On Qwant your queries _may_ have to be phrased just slightly differently (more old school - less questions based such as "what is the standard bike chain size" and more keywords based such as "bike chain roller standard size") which is how it should be, overall imo.

They have very limited settings to fine-tune, but overall their results were great.