Jackoamon

https://help.kagi.com/kagi/search-details/search-sources.html

They use many sources, including other search engines and specific websites, but also claim to use two of their own indexes.

Can’t say much in regards to perplexity, but I find kagi’s index to be quite nice. Especially if you find fortune forum posts helpful (which I do as a software dev). It’s paid only, so there’s no advertising incentive to the company and also a ton of configuration. I search a lot, so I went with the 10 dollar plan. 5 bucks gets you 300 searches a month, 10 is unlimited plus access to their LLM which documents information sources like perplexity.

Personally, I found perplexity to be quite annoying with the more ai focused UI and trying to learn your interests. Kagi is a search engine first plus some other features they’re developing.

And there’s also WARs for servelets, uberjars, various means of bundling for exes, native compilation via Graal. Overall quite the ignorant meme.