I also use kagi.com (the name is quite funny for Italian speakers…).

For those interested in “why”, here are my reasons:

• generally, very high quality results.
• completely ad-free and with an ironclad privacy policy (probably the best I have seen so far)
• paid, which can be a downside, but it’s also a way for me to know that I am the customer, not advertisers.
• ability to use bangs and to create custom ones
• ability to easily filter by area, there are a fee common areas such as “programming” or “recipe” or “academic” which affect the context of the search.
• ability to up/downrank websites. If I personally find a certain website providing often useful answers for me, I can uprank it and make it show higher in the searches.
• finally, a small cosmetic thing, but the results are organized very nicely, such as “best 10 x” articles being in a simple list and saving space, etc.

As a bonus, the company seems nicely transparent and overall well-intentioned. I hope it stays like this.