The best alternatives to Result Tree are Muzli, Algolia, and Search Funnel. If these 3 options don't work for you, we've listed a few more alternatives below.
Muzli is a new-tab browser plugin that instantly delivers relevant design stories and inspiration.
Muzli instantly delivers cutting-edge design projects and news each time a new tab is open in your browser.
Declutter your home screen! Rather than have separate apps on your home screen for Amazon, Google, Pinterest, IMDb, etc... you can have ONE app to use as the basis for beginning your search. Simply type in what you want to search, then select where to view the results from. You'll instantly be brought to the respective service's search results.
Why search from just one website when you could search from many? And what if you could target your search by category too? These are the questions that led me to make Search Aggregate, the all-in-one searching tool.
QuestionBox is an AI powered widget trained on your website docs, FAQs, privacy terms... actually, it is trained on whatever you want. I think it could help solopreneurs or small teams automating some customer support tickets!