SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
Event Viewer - Get help, support, and tutorials for Windows products—Windows 10, Windows 8.1, Windows 7, and Windows 10 Mobile.
Numi - Numi is a beautiful text calculator for Mac.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Calca - Calca is an advanced symbolic calculator for iOS, OS X, and Windows that's as easy to use as a text editor.
WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.