Perplexity.ai - Ask anything

Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.

You.com - You.com, the world's first open search engine platform that summarizes the web for users, with superior privacy choices, actionable results, extensible apps and personalization through preferred sources.

LanguageBeast.com - Study English synonyms and antonyms to enrich your vocabulary

Phind - Shazam for landmarks and locations

Babble - A more personalized social network