DuckDuckGo - The Internet privacy company that empowers you to seamlessly take control of your personal information online, without any tradeoffs.
AnyMailFinder.com - Find anyone's email address
Google - Google Search, also referred to as Google Web Search or simply Google, is a web search engine developed by Google. It is the most used search engine on the World Wide Web
Hunter - Find all the email addresses related to a domain
Searx - Open source metasearch engine
GitHub Email Finder - Find the email of any GitHub Developer using their GitHub username.