DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
DuckDuckGo - The Internet privacy company that empowers you to seamlessly take control of your personal information online, without any tradeoffs.
TaskSurfer - TaskSurfer gives you all of the tools you need to manage things the way you want.
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
HoudahSpot - Advanced File Search Utility for Mac OS X
Searx - Open source metasearch engine