DuckDuckGo is an alternative search engine that has rich features, respects your privacy, and is built from free/open-source software.
Searx is a free internet metasearch engine which aggregates results from more than 70 search services. Users are neither tracked nor profiled. Additionally, searx can be used over Tor for online anonymity.
Google Search is the most popular search engine on the Internet. Google can search for webpages, images, videos, news, and various other forms of media.
Bing (formerly Live Search, Windows Live Search, and MSN Search) is the current web search engine (advertised as a "decision engine") from Microsoft.
Yandex is the fastest growing search engine in the world, serving primarily Russian users. It has been experimenting with an English-based search engine, but its main operations are for its Cyrillic engine.