Sum Fun - A fun number puzzle game for iPhone and iPad.
DuckDuckGo - The Internet privacy company that empowers you to seamlessly take control of your personal information online, without any tradeoffs.
Sum - Simple Maths Puzzle - How fast can you add two numbers?
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
Griddition - Griddition is a challenging numbers puzzle where you must fill a grid with numbers, Sudoku-style.
Searx - Open source metasearch engine